Update bothe file1 and file2 None, error_msg

radiobee/gradiobee.py

@@ -106,6 +106,10 @@ def gradiobee(  # noqa
     # outputs: check return
     # if outputs is modified, also need to modify error_msg's outputs
 
+    if not (file1 or file2):
+        msg = "Nothing to do..."
+        return error_msg(msg)
+
     # convert "None" to None for those Radio types
     for _ in [idf_type, dl_type, norm]:
         if _ in "None":