fix: add error handling for module imports to prevent startup crashes

app.py

@@ -4,7 +4,19 @@ import sys
 import json
 import argparse
 from types import SimpleNamespace
-from support.detect import run_detect
+
+# Try to import detector - if this fails, we'll show an error in the UI
+try:
+    from support.detect import run_detect
+    DETECTOR_AVAILABLE = True
+    IMPORT_ERROR = None
+except Exception as e:
+    DETECTOR_AVAILABLE = False
+    IMPORT_ERROR = str(e)
+    print(f"Warning: Could not import detector: {e}")
+    # Create a dummy function
+    def run_detect(args):
+        raise ImportError(f"Detector not available: {IMPORT_ERROR}")
 
 # Download weights on first run (for HF Spaces)
 if os.environ.get("SPACE_ID"):
@@ -18,6 +30,14 @@ if os.environ.get("SPACE_ID"):
 DETECTORS = ['R50_TF', 'R50_nodown', 'CLIP-D', 'P2G', 'NPR']
 
 def predict(image_path, detector_name):
+    # Check if detector is available
+    if not DETECTOR_AVAILABLE:
+        return json.dumps({
+            "error": "Detector module not available",
+            "details": IMPORT_ERROR,
+            "message": "The detection system could not be initialized. Please check the logs."
+        }, indent=2)
+    
     if not image_path:
         return json.dumps({"error": "Please upload an image."}, indent=2)