1) Fix projection deleting other pos tiers. Now only deletes a previous version of itself. 2) Now returns bilingual alignment tiers that exist, but are empty. (Compared to "None" rather than evaluated as boolean)
1) Fix projection deleting other pos tiers. Now only deletes a previous version of itself.
2) Now returns bilingual alignment tiers that exist, but are empty. (Compared to "None" rather than evaluated as boolean)


Former-commit-id: e603ed3f53b1b798bb11448a452d14e8da5871da
rgeorgi/intent