remove system exits from datafetcher tests

apps/cli/executables/datafetcher/datafetcher/datafetcher.py

@@ -112,11 +112,7 @@ def main():
     from the command line.
     """
 
-    try:
-        args = get_arg_parser().parse_args()
-    except (SystemExit, Exception) as exc:
-        # most likely a parameter was omitted
-        raise MissingSettingsException from exc
+    args = get_arg_parser().parse_args()
 
     settings = get_capo_settings(args.profile)
     DataFetcher(args, settings).run()