g.mapset: dialog must be destroyed, app.MainLoop seems not necessary here; remove unused imports, whitespace clean up

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@65291 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/modules/mapsets_picker.py

@@ -1,33 +1,27 @@
 #!/usr/bin/env python
 
-import os
-import sys
-import pwd
-
-from grass.script import core as grass
-
 import wx
-import wx.lib.mixins.listctrl as listmix
 
-from core.gcmd import RunCommand 
+from core.gcmd import RunCommand
 from core.utils import _
 from gui_core.preferences import MapsetAccess
 
+
 def main():
     app = wx.App()
 
     dlg = MapsetAccess(parent = None)
     dlg.CenterOnScreen()
-        
+
     if dlg.ShowModal() == wx.ID_OK:
         ms = dlg.GetMapsets()
         RunCommand('g.mapsets',
                    parent = None,
                    mapset = '%s' % ','.join(ms),
                    operation = 'set')
-    
-    app.MainLoop()
+
+    dlg.Destroy()
+
 
 if __name__ == "__main__":
     main()
-