Regression: SAFE_POINT on removing sequence consisting of gaps

SAFE POINT occurs if try to remove line consisting of gaps in the end of the name list.

There is no this issue in the release 33.0.

Scenario:

1. Open "_common_data/scenarios/msa/translation_nucl.aln".
2. Select "P" sequense, last in the name list.
3. Select first symbol and insert gap. 
4. Click "Delete" button 3 times.
   Expected result: a line consisting of gaps should be removed
   Actual result: SAFE_POINT triggered
   **

Trying to recover from error: Internal error: unexpected row index was passed to MAlignmnet::getRow at src\datatype\msa\MultipleAlignment.cpp:216
Assertion failed: rowIndex >= 0 && (rowIndex < rowsCount), file src\datatype\msa\MultipleAlignment.cpp, line 216