Error on opening empty file in the Alignment Editor

Affected test:
GUITest_regression_scenarios_test_4334

Scenario:

1. Open "common_data/fasta/empty.fa".
   Expected state: There is not errors in the log.
   Actual state: There is an error:

   [ERROR][11:29] Trying to recover from error: No rows at src\datatype\msa\MultipleAlignment.cpp:215
   

2. Add a sequence to the alignment from file "samples/FASTA.human_T1.fa".
   Expected state: There is not errors in the log.
   Actual state: There is an error:

   [ERROR][11:26] Trying to recover from error: Incorrect parameters were passed to MultipleSequenceAlignmentData::removeRegion: startRow '0', nRows '0', the number of rows is '0' at src\datatype\msa\MultipleSequenceAlignment.cpp:447