getcluster prints a traceback on a bad version number

[jdreed]

Traceback (most recent call last):
  File "/usr/bin/getcluster", line 218, in <module>
    sys.exit(main())
  File "/usr/bin/getcluster", line 177, in main
    elif vercmp(vers, ws_version) < 0:
  File "/usr/bin/getcluster", line 46, in vercmp
    v2l = map(int, map(lambda x: 0 if x is None else x, re.search('^(\d+)(?:\.(\d+)){0,1}',v2).groups()))
AttributeError: 'NoneType' object has no attribute 'groups'

[jdreed]

 https://github.com/mit-athena/getcluster/pull/1