Fix better logging on error on data frame from collected data

dca-carouge-fountain/app.py

@@ -412,7 +412,7 @@ def _update_historical_db_from_local_raw_files():
 
         else:
             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)))
+                  "expected either 1 or 5 values from device, but got {}".format(json_file, values))
             continue
 
         data.append(entity)