wxGUI: fix https://trac.osgeo.org/grass/ticket/2091, https://trac.osgeo.org/grass/ticket/1808, https://trac.osgeo.org/grass/ticket/1814

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@57950 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_core/forms.py

@@ -2316,9 +2316,10 @@ class GUI:
                                        { 'cmd' : cmd[0],
                                          'key' : key })
                         continue
+                    multiple = element['multiple']
                     element = element['element']
-                    
-                    if element in ['cell', 'vector']:
+                    # do we need to find mapset for each of multiple maps?
+                    if element in ['cell', 'vector'] and not multiple:
                         # mapname -> mapname@mapset
                         try:
                             name, mapset = value.split('@')