While using constructors in Operator classes is _really_ not recommended, BPY code was a bit too eager to overwrite existing errors with its own generic messages. Now only generate these exceptions if there is no other exception already set.
While using constructors in Operator classes is _really_ not recommended, BPY code was a bit too eager to overwrite existing errors with its own generic messages. Now only generate these exceptions if there is no other exception already set.