Repository: transformers
Issue: `modular_model_converter` can not handle objects import via try - except
Labels: bug,Modular

### System Info

transformers 4.48.0.dev0 d8c1db2f568d4bcc254bc046036acf0d6bba8373

### Who can help?

@ArthurZucker 

### Information

- [ ] The official example scripts
- [X] My own modified scripts

### Tasks

- [ ] An officially supported task in the `examples` folder (such as GLUE/SQuAD, ...)
- [X] My own task or dataset (give details below)

### Reproduction

# How to reproduce?

1. Clone the Transformers repository and check out the specified commit:

`git clone git@github.com:huggingface/transformers.git && cd transformers && git checkout d8c1db2f568d4bcc254bc046036acf0d6bba8373`

2. Create a new folder named `xxx_model` in `src/transformers/models/`

3. Inside this folder, create a new Python file called `modular_xxx.py` with the following content:
```
import torch
import torch.nn as nn
try:
    import torch.nn.functional as F
except:
    pass

from ..llama.modeling_llama import (
    LlamaMLP,
)

class Model(nn.Module):
    def forward(self, x, w):
        return F.linear(x, w)
```

4. Run the following command to execute the model converter:
`python utils/modular_model_converter.py --files_to_parse src/transformers/models/xxx_model/modular_xxx.py` 

This will generate the modeling file at:  `src/transformers/models/xxx_model/modeling_xxx.py`.

### Expected behavior

# Expected vs Actual Contents in src/transformers/models/xxx_model/modeling_xxx.py

The **expected** contents in `src/transformers/models/xxx_model/modeling_xxx.py` is : 

```
#                🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨
#           This file was automatically generated from src/transformers/models/xxx_model/modular_xxx.py.
#               Do NOT edit this file manually as any edits will be overwritten by the generation of
#             the file from the modular. If any change should be done, please apply the change to the
#                          modular_xxx.py file directly. One of our CI enforces this.
#                🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨
import torch.nn as nn

try:
    import torch.nn.functional as F
except:
    pass

class Model(nn.Module):
    def forward(self, x, w):
        return F.linear(x, w)
```

However, the **actual** content generated in `src/transformers/models/xxx_model/modeling_xxx.py` is : 

```
#                🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨
#           This file was automatically generated from src/transformers/models/xxx_model/modular_xxx.py.
#               Do NOT edit this file manually as any edits will be overwritten by the generation of
#             the file from the modular. If any change should be done, please apply the change to the
#                          modular_xxx.py file directly. One of our CI enforces this.
#                🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨
import torch.nn as nn


class Model(nn.Module):
    def forward(self, x, w):
        return F.linear(x, w)
```

# Issue

The lines `try: import torch.nn.functional as F except: pass` are missing in the actual content, even though it exists in the original modular file.