update for migrategroups extension

extensions/fablabchemnitz_migrategroups.inx

@@ -11,6 +11,6 @@
         </effects-menu>
     </effect>
     <script>
-        <command reldir="extensions" interpreter="python">fablabchemnitz_migrategroups.py</command>
+        <command location="inx" interpreter="python">fablabchemnitz_migrategroups.py</command>
     </script>
 </inkscape-extension>

extensions/fablabchemnitz_migrategroups.py

@@ -57,6 +57,7 @@ class MigrateGroups(inkex.Effect):
                     group.getparent().remove(group)
                     
         #remove the selected, now empty group (if it's the case)
+        if len(self.svg.selected) > 0:
             if self.svg.selected[0].tag == inkex.addNS('g','svg'):
                 self.svg.selected[0].getparent().remove(self.svg.selected[0])