SAFE_POINT on "Extract consensus from assemby" workflow with GFF output

Scenario:

1. Open Tools->NGS->"Extract consensus from assemby" workflow
2. Set input assembly file to  common_data/ugenegb/1.bam.ugenegb
3. Set document format="ugenegb" or "Vector NTI seqience"
4. Run
   Error: Unknown data format for writing: usqlite
   or
   Error: Unknown data format for writing: vector_nti_sequence
5. Set document format="GFF"
6. Trying to recover from error: Add sequence to document: empty length at C:\BuildAgent\work\release\ugene\src\plugins\workflow_designer\src\library\DocWorkers.cpp:226