fix: bbox bugs

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

app.py

@@ -54,14 +54,14 @@ def process_refexp(image: Image, prompt: str):
     sequence = re.sub(r"<.*?>", "", sequence, count=1).strip()
     print(
         fr"predicted decoder sequence before token2json: {html.escape(sequence)}")
-    bbox = processor.token2json(sequence)
+    seqjson = processor.token2json(sequence)
 
     # safeguard in case predicted sequence does not include a target_bounding_box token
-    bbox = target_bbox.get('target_bounding_box')
+    bbox = seqjson.get('target_bounding_box')
     if bbox is None:
         print(
             f"token2bbox seq has no predicted target_bounding_box, seq:{seq}")
-        bbox = bbox = {"xmin": 0, "ymin": 0, "xmax": 0, "ymax": 0}
+        bbox = {"xmin": 0, "ymin": 0, "xmax": 0, "ymax": 0}
         return bbox
 
     print(f"predicted bounding box with text coordinates: {bbox}")