SAFE_POINT on Make BLAST DB

Scenario:

1. Open start page
2. Click create sequence
3. Seq: A, name: 123
   Expected: sequence is opened
4. Enable edit mode, remove the only base
   Expected: Dialog "Would you like to completely remove the sequence?"
5. Click Yes
6. Click on 123 in Project View Right Mouse Button
7. Click BLAST -> Make BLAST DB...
   Current: SAFE_POINT: Trying to recover from error: FASTA document: sequence objects count error at BuildAgent\work\release\ugene\src\plugins\external_tool_support\src\ETSProjectViewItemsController.cpp:93