wxGUI: add missing signal tofix WMS render manager

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@69343 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/core/ws.py

@@ -69,6 +69,7 @@ class RenderWMSMgr(wx.EvtHandler):
 
         self.dataFetched = Signal('RenderWMSMgr.dataFetched')
         self.updateProgress = Signal('RenderWMSMgr.updateProgress')
+        self.renderingFailed = Signal('RenderWMSMgr.renderingFailed')
 
     def __del__(self):
         try_remove(self.tempMap)