fix: bugs

Signed-off-by: ivelin <ivelin.eth@gmail.com>

app.py

@@ -64,14 +64,10 @@ def process_refexp(image: Image, prompt: str):
     print(f"processed prompt: {prompt}")
 
     # safeguard in case text prediction is missing some bounding box coordinates
-    xmin = math.floor(width*float(bbox["xmin"])
-                      ) if bbox.get("xmin") is not None else 0
-    ymin = math.floor(
-        height*float(bbox["ymin"])) if bbox.get("ymin") is not None else 0
-    xmax = math.floor(width*float(bbox["xmax"])
-                      ) if bbox.get("xmax") is not None else 1
-    ymax = math.floor(
-        height*float(bbox["ymax"])) if bbox.get("ymax") is not None else 1
+    xmin = math.floor(width*float(bbox.get("xmin", 0)))
+    ymin = math.floor(height*float(bbox.get("ymin", 0)))
+    xmax = math.floor(width*float(bbox.get("xmax", 1)))
+    ymax = math.floor(height*float(bbox.get("ymax", 1)))
 
     print(
         f"to image pixel values: xmin, ymin, xmax, ymax: {xmin, ymin, xmax, ymax}")