add exception when 0 detection

coordinate_g.py

@@ -18,7 +18,9 @@ if len(csv_list) != 1 :
     d2['x'] = 1920 - d2['x']
 
     df_conc = pd.concat([d1,d2])
-
+if len(d1) == 0 and len(d2) == 0:
+    dummy_dic = {'x':[0,1920], 'y':[1080,0], 'z':[1.0,5.0], 'frame':[1,1900]}
+    df_conc = pd.DataFrame(dummy_dic)
 df_conc.sort_values(by='frame')
 df_conc.drop_duplicates(['frame'])
 #print(df_conc)