TRUNK-4260: Error while submitting empty form in the page: openmrs/admin/concepts/conceptSource.form
Merge pull request #969 from rpuzdrowski/TRUNK-4260

TRUNK-4260: Error while submitting empty form in the page: openmrs/admin/concepts/conceptSource.form
Added @Transaction annotation to ProviderServiceImpl.getUnknownProvider() to make it read only - TRUNK-4402