Uploading a XLSForm with empty labels throws IntegrityError

[oliverroick]

Steps to reproduce the error

• Create a new project
• In the wizard, upload an XLSForm with empty labels
• Finish the remaining steps in the wizards and save the project.

Actual behavior

Saving the project throws an IntegrityError. The field label_xlat in QuestionOption models can be an empty dict but not None. This line reads empty values to None, which leads to the exception. The line should read label_xlat=o.get('label_xlat', o.get('label', {})) instead.

Expected behavior

The form should be processed without throwing an exception.

[ian-ross]

Agreed. Silly mistake. I'll fix it now.