wxNVIZ: fix progress error on wx 2.9

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@56334 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/nviz/wxnviz.py

@@ -67,6 +67,8 @@ def print_progress(value):
     """!Redirect progress info"""
     global progress
     if progress:
+        if not progress.GetRange() == 100:
+            progress.SetRange(100)
         progress.SetValue(value)
     else:
         print value