Fix better logging on error on data frame from collected data

dca-carouge-fountain/app.py

@@ -411,7 +411,8 @@ def _update_historical_db_from_local_raw_files():
             )
 
         else:
-            print("(!) WARNING device values are not what was expected, dev1 -> 5 values, dev2 -> 1 value")
+            print("(!) WARNING device values are not what was expected in file {}, "
+                  "expected either 1 or 5 values from device, but got {}".format(json_file,len(values)))
             continue
 
         data.append(entity)