Fix error with Gallery with no albums
Modify publish() pushbutton callback to not include the strip_metadata bool argument

This boolean is included in the PublishingParameters class now.
Don't set tag relationships if strip_metadata is set
Implement basics of a "video test" option to not upload files that may not be supported by Gallery3

This may not be a good thing since it can only test the extension of the video file right now and, therefore, isn't very reliable.