Update app.py

app.py

@@ -37,7 +37,7 @@ def process_vid(file,cur_frame):
     frame_count = int(capture.get(cv2.CAP_PROP_FRAME_COUNT))
     rev_img_searcher = ReverseImageSearcher()
     html_out=""
-    if cur_frame == ""
+    if cur_frame == "":
         start_frame = 0
     elif cur_frame != "":
         start_frame = int(cur_frame)