Update smb.py

Fix the "ValueError: too many values to unpack" error generated by the experimental fix for a response that is not an AD  SID.
Merge pull request #39 from unixnation/patch-1

Update smb.py - bug fix from sheffield
Update smb.py

Updated to show the error message in the user and group boxes if debugging is enabled otherwise just display the value 'Unknown' to the user.
Merge pull request #40 from unixnation/patch-1

Update smb.py - Patch from Sheffield uni for display SID values
All logins are now lowercased to ensure keys for redis are the same. Fixes #37