fix bug

app.py

@@ -80,12 +80,13 @@ def get_image_bytes(image):
 
 # Define a function to handle image and text caption
 def process_image_and_caption(username_input, image, caption):
+    #check image 
     if image is None:
         gr.Warning("No image uploaded!", duration=5)
         return "No image uploaded!", image, caption
-    print("here is cation" + caption)
-    print("here is cation type" + str(type(caption)))
-    if caption is None:
+
+    # check caption
+    if not caption.strip():
         gr.Warning("No caption uploaded!", duration=5)
         return "No caption uploaded!", image, caption
     # Get current time in GMT+7