pythonlib/script: ignore any errors from g.version (backport of https://trac.osgeo.org/grass/changeset/62822)

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@62823 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/python/script/core.py

@@ -1464,7 +1464,7 @@ def version():
          'revision': '53670'}
 
     """
-    data = parse_command('g.version', flags='rge')
+    data = parse_command('g.version', flags='rge', errors='ignore')
     for k, v in data.iteritems():
         data[k.strip()] = v.replace('"', '').strip()