Merge pull request #910 from janezd/select-columns-commit

Select columns: unconditionally commit new data

Orange/widgets/data/owselectcolumns.py

@@ -486,7 +486,7 @@ def set_data(self, data=None):
             self.meta_attrs[:] = []
             self.available_attrs[:] = []
 
-        self.commit()
+        self.unconditional_commit()
 
     def update_domain_role_hints(self):
         """ Update the domain hints to be stored in the widgets settings.