Test failure in i686 with version 1.3.1

### Describe the bug

During the build of scikit-learn for Fedora Linux, I'm obtaining an error runing the tests in i686. The test that fails is:

`sklearn/tree/tests/test_export.py::test_graphviz_toy`

### Steps/Code to Reproduce

In a i686 machine

```
pytest sklearn/tree/tests/test_export.py
```

### Expected Results

Test passes

### Actual Results

```
sklearn/tree/tests/test_export.py::test_graphviz_toy FAILED              [ 93%]
=================================== FAILURES ===================================
______________________________ test_graphviz_toy _______________________________
    def test_graphviz_toy():
        # Check correctness of export_graphviz
        clf = DecisionTreeClassifier(
            max_depth=3, min_samples_split=2, criterion="gini", random_state=2
        )
        clf.fit(X, y)
    
        # Test export code
        contents1 = export_graphviz(clf, out_file=None)
        contents2 = (
            "digraph Tree {\n"
            'node [shape=box, fontname="helvetica"] ;\n'
            'edge [fontname="helvetica"] ;\n'
            '0 [label="x[0] <= 0.0\\ngini = 0.5\\nsamples = 6\\n'
            'value = [3, 3]"] ;\n'
            '1 [label="gini = 0.0\\nsamples = 3\\nvalue = [3, 0]"] ;\n'
            "0 -> 1 [labeldistance=2.5, labelangle=45, "
            'headlabel="True"] ;\n'
            '2 [label="gini = 0.0\\nsamples = 3\\nvalue = [0, 3]"] ;\n'
            "0 -> 2 [labeldistance=2.5, labelangle=-45, "
            'headlabel="False"] ;\n'
            "}"
        )
    
        assert contents1 == contents2
    
        # Test plot_options
        contents1 = export_graphviz(
            clf,
            filled=True,
            impurity=False,
            proportion=True,
            special_characters=True,
            rounded=True,
            out_file=None,
            fontname="sans",
        )
        contents2 = (
            "digraph Tree {\n"
            'node [shape=box, style="filled, rounded", color="black", '
            'fontname="sans"] ;\n'
            'edge [fontname="sans"] ;\n'
            "0 [label=<x<SUB>0</SUB> &le; 0.0<br/>samples = 100.0%<br/>"
            'value = [0.5, 0.5]>, fillcolor="#ffffff"] ;\n'
            "1 [label=<samples = 50.0%<br/>value = [1.0, 0.0]>, "
            'fillcolor="#e58139"] ;\n'
            "0 -> 1 [labeldistance=2.5, labelangle=45, "
            'headlabel="True"] ;\n'
            "2 [label=<samples = 50.0%<br/>value = [0.0, 1.0]>, "
            'fillcolor="#399de5"] ;\n'
            "0 -> 2 [labeldistance=2.5, labelangle=-45, "
            'headlabel="False"] ;\n'
            "}"
        )
    
        assert contents1 == contents2
    
        # Test max_depth
        contents1 = export_graphviz(clf, max_depth=0, class_names=True, out_file=None)
        contents2 = (
            "digraph Tree {\n"
            'node [shape=box, fontname="helvetica"] ;\n'
            'edge [fontname="helvetica"] ;\n'
            '0 [label="x[0] <= 0.0\\ngini = 0.5\\nsamples = 6\\n'
            'value = [3, 3]\\nclass = y[0]"] ;\n'
            '1 [label="(...)"] ;\n'
            "0 -> 1 ;\n"
            '2 [label="(...)"] ;\n'
            "0 -> 2 ;\n"
            "}"
        )
    
        assert contents1 == contents2
    
        # Test max_depth with plot_options
        contents1 = export_graphviz(
            clf, max_depth=0, filled=True, out_file=None, node_ids=True
        )
        contents2 = (
            "digraph Tree {\n"
            'node [shape=box, style="filled", color="black", '
            'fontname="helvetica"] ;\n'
            'edge [fontname="helvetica"] ;\n'
            '0 [label="node #0\\nx[0] <= 0.0\\ngini = 0.5\\n'
            'samples = 6\\nvalue = [3, 3]", fillcolor="#ffffff"] ;\n'
            '1 [label="(...)", fillcolor="#C0C0C0"] ;\n'
            "0 -> 1 ;\n"
            '2 [label="(...)", fillcolor="#C0C0C0"] ;\n'
            "0 -> 2 ;\n"
            "}"
        )
    
        assert contents1 == contents2
    
        # Test multi-output with weighted samples
        clf = DecisionTreeClassifier(
            max_depth=2, min_samples_split=2, criterion="gini", random_state=2
        )
        clf = clf.fit(X, y2, sample_weight=w)
    
>       contents1 = export_graphviz(clf, filled=True, impurity=False, out_file=None)
sklearn/tree/tests/test_export.py:131: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
sklearn/utils/_param_validation.py:211: in wrapper
    return func(*args, **kwargs)
sklearn/tree/_export.py:905: in export_graphviz
    exporter.export(decision_tree)
sklearn/tree/_export.py:465: in export
    self.recurse(decision_tree.tree_, 0, criterion=decision_tree.criterion)
sklearn/tree/_export.py:528: in recurse
    ', fillcolor="%s"' % self.get_fill_color(tree, node_id)
sklearn/tree/_export.py:285: in get_fill_color
    return self.get_color(node_val)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
self = <sklearn.tree._export._DOTTreeExporter object at 0xc5080408>
value = -0.4691358024691358
    def get_color(self, value):
        # Find the appropriate color & intensity for a node
        if self.colors["bounds"] is None:
            # Classification tree
            color = list(self.colors["rgb"][np.argmax(value)])
            sorted_values = sorted(value, reverse=True)
            if len(sorted_values) == 1:
                alpha = 0.0
            else:
                alpha = (sorted_values[0] - sorted_values[1]) / (1 - sorted_values[1])
        else:
            # Regression tree or multi-output
            color = list(self.colors["rgb"][0])
            alpha = (value - self.colors["bounds"][0]) / (
                self.colors["bounds"][1] - self.colors["bounds"][0]
            )
        # compute the color as alpha against white
>       color = [int(round(alpha * c + (1 - alpha) * 255, 0)) for c in color]
E       ValueError: cannot convert float NaN to integer
```

### Versions

```shell
Version is 1.3.1
```

COMMENT:
Thanks @sergiopasra for reporting. So I am almost sure that taking the `nanmin`/`nanmax` will work. But I am puzzled that we have impurity set to `nan` in the decision tree. The issue might also be that we don't have anymore test on the CIs that run 32 bits architecture. This is also puzzling me that you don't get any other failures related to the decision tree :).

Labels: Bug