Merge pull request #14 from WhereGroup/fix_crash_stylechange

Don't try to refresh filter geometry display if no filter is set

Author: kannes

widgets.py

@@ -415,7 +415,7 @@ def onFilterStyleChanged(self, *args, **kwargs):
         self.symbol = self.styleFilterButton.symbol().clone()
         self.saveFilterSymbol()
 
-        if self.showGeomStatus:
+        if self.showGeomStatus and self.controller.currentFilter:
             self.hideFilterGeom()
             self.showFilterGeom()