Log error when user wants to save current file without name on scene open.
Log error when user wants to save current file without name on scene open.

This captures an edge case where if the user had never saved before but has scene modification, then tries to open a Work File and click "Yes" on Save Changes where it actually couldn't due to the file not having any saved name yet.

mindbender-studio/core,getavalon/core,getavalon/core,mindbender-studio/core