Problem with primer export to shared database

Issue detected with GUITest_common_scenarios_primer_library_test_0008
on Linux and Windows nightly builds

1. Load shared database "ugene_gui_test"
2. Create any primer and select it
3. Push "Export primer(s)" button
4. Set in "Export Primers" dialog
"Export to": shared database
"Database": ugene_gui_test
"Destination Folder:: /pcrlib/test_0008
5. Push OK
Expected state: new primer in "/pcrlib/test_0008" directory
Actual state: export failed

Promoting task

to 'Running'
SQL: error: Error: Column 'alphabet' cannot be null QMYSQL3: Unable to execute statement; Query: 'INSERT INTO Sequence(object, length, alphabet, circular) VALUES(:object, :length, :alphabet, :circular)' Bound values: :alphabet = ; :circular = false; :length = 0; :object = 377; in query: INSERT INTO Sequence(object, length, alphabet, circular) VALUES(:object, :length, :alphabet, :circular)
AppResource Threads ::release 1, available 999
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