wxGUI: v.category in quiet mode

       (merge from devbr6, https://trac.osgeo.org/grass/changeset/34474)


git-svn-id: https://svn.osgeo.org/grass/grass/trunk@34475 15284696-431f-4ddb-bdfa-cd5b030d7da7

gui/wxpython/gui_modules/utils.py

@@ -246,7 +246,7 @@ def GetVectorNumberOfLayers(vector):
                'option=report']
     
     layers = []
-    for line in gcmd.Command(cmdlist).ReadStdOutput():
+    for line in gcmd.Command(cmdlist, rerr=None).ReadStdOutput():
         if not 'Layer' in line:
             continue