<ticket>#575</ticket> Added missing disconnect call
<ticket>#575</ticket>
Added missing disconnect call

gui/variable_dropbox.py:
- QVerticalWidget.clear: Added disconnect call

minesense/VisTrails,Nikea/VisTrails,hjanime/VisTrails,celiafish/VisTrails,hjanime/VisTrails,celiafish/VisTrails,VisTrails/VisTrails,VisTrails/VisTrails,minesense/VisTrails,minesense/VisTrails,hjanime/VisTrails,celiafish/VisTrails,Nikea/VisTrails,Nikea/VisTrails,VisTrails/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,minesense/VisTrails,hjanime/VisTrails,VisTrails/VisTrails,Nikea/VisTrails,celiafish/VisTrails,minesense/VisTrails