don't show the message dialog on import unless there is already an app object

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28919 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wx/lib/wxPlotCanvas.py

@@ -51,14 +51,13 @@ imported.  It probably is not installed (it's not part of the standard
 Python distribution). See the Python site (http://www.python.org) for
 information on downloading source or binaries."""
 
-    if wx.Platform == '__WXMSW__':
+    print msg
+    if wx.Platform == '__WXMSW__' and wx.GetApp() is not None:
         d = wx.MessageDialog(None, msg, "Numeric not found")
         if d.ShowModal() == wx.ID_CANCEL:
             d = wx.MessageDialog(None, "I kid you not! Pressing Cancel won't help you!", "Not a joke", wx.OK)
             d.ShowModal()
-    else:
-        print msg
-    raise ImportError
+    raise
 
 #
 # Plotting classes...