Steps to reproduce:
1. Open "COI.aln"
2. Add existing tree or build tree and display it in MSAEditor
3. Close MSAEditor
4. Unload document with tree
5. Open "COI.aln"
6. Open document with tree
Current state:
UGENE crashes
Steps to reproduce:
1. Open "COI.aln"
2. Add existing tree or build tree and display it in MSAEditor
3. Close MSAEditor
4. Unload document with tree
5. Open "COI.aln"
6. Open document with tree
Current state:
UGENE crashes