Crash in Sanger dialog when reference has wrong format

Regression in 49.0 version in UGENE-7902
Scenario:

1. Open Tools->Sanger data ahalysis-> Map reads to reference
2. Set wrong format reference file from sample: sample/ACE/k26.ace
3. Add reads: sample/ABIF/A01.abi
4. Click Map button
   Crash: error 'wrong reference format'

The same crash for .bam, .sam, .apr, .sto, .hmm, .nwk reference formats

Another scenario:

1. Open Tools->Sanger data ahalysis-> Map reads to reference
2. Set unexisting reference file: d:/asdfsdgfdgd
3. Add reads: sample/ABIF/A01.abi
4. Click Map button
   Crash: error 'The 'asdfsdgfdgd' reference file doesn't exist.'

Note, that there are no crashes in Workflow Designer sample Trim and Align Sanger Reads for wrong reference format or unexisting reference file.