1. Open "data/samples/FASTA/human_T1.fa".
2. Unload "human_T1.fa" document.
3. Select {Tools -> BLAST -> BLAST Search...} menu item in the main menu.
4. Set "data/samples/FASTA/human_T1.fa" as input file.
5. Expected state: the document is loaded, a view is opened.
6. Current state: a message box appears, it contains an error: "This file does not contain any sequence.".