Fixed "Open Recent..." crash bug in PySide builds.
Fixed "Open Recent..." crash bug in PySide builds.

Fixes #548.

chippey/gaffer,davidsminor/gaffer,hradec/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,chippey/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,chippey/gaffer,chippey/gaffer,ImageEngine/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,boberfly/gaffer,andrewkaufman/gaffer,goddardl/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,GafferHQ/gaffer,boberfly/gaffer,goddardl/gaffer,ivanimanishi/gaffer,GafferHQ/gaffer,hradec/gaffer,johnhaddon/gaffer,hradec/gaffer,goddardl/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,cedriclaunay/gaffer,cedriclaunay/gaffer,goddardl/gaffer,johnhaddon/gaffer,ivanimanishi/gaffer,boberfly/gaffer,hradec/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,davidsminor/gaffer,cedriclaunay/gaffer,hradec/gaffer,ivanimanishi/gaffer,boberfly/gaffer,andrewkaufman/gaffer,ImageEngine/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,appleseedhq/gaffer,ivanimanishi/gaffer,davidsminor/gaffer,davidsminor/gaffer,cedriclaunay/gaffer,lucienfostier/gaffer