Update app.py

app.py

@@ -142,10 +142,13 @@ def preprocess_video(input_video_path):
 
 def predict(process_video):
     os.chdir('/home/user/app')
-    os.system('bash TestVisual.sh')
-    pred=[]
-    fi = open("/home/user/app/result/ho.txt", 'r')
-    pred = fi.readlines()
+    try:
+        os.system('bash ./TestVisual.sh')
+        pred=[]
+        fi = open("/home/user/app/result/ho.txt", 'r')
+        pred = fi.readlines()
+    except IndexError:
+        pred=['error']
     return pred[-1]