Implement users command to see the mutual users of one or more channels and squash some bugs

commands/chans.py

@@ -7,6 +7,9 @@ class Chans:
 
     def chans(self, addr, authed, data, obj, spl, success, failure, info, incUsage, length):
         if authed:
+            if len(spl) < 2:
+                incUsage("chans")
+                return
             result = userinfo.getChans(spl[1:])
             rtrn = ""
             for i in result.keys():