Nothing happends on moving topic without branch selection

1. Log in as Moderator.
2. Select some section -> branch -> topic.
3. Click the button 'Move' in the upper right corner of the first post in the topic.
4. Select some section (not current), don't select any branch, click 'move' button

AR
The box 'move topic' is closed, topic wasn't moved

ER
"Move" button should be disabled in case branch isn't selected