Refactor code for readability and compatibility.

evennia/comms/channelhandler.py

@@ -79,6 +79,7 @@ class ChannelCommand(command.Command):
             try:
                 self.history_start = int(arg) if arg else 0
             except ValueError:
+                # if no valid number was given, ignore it
                 pass
         self.args = (channelname.strip(), msg.strip())
 

evennia/comms/managers.py

@@ -401,6 +401,7 @@ class ChannelDBManager(TypedObjectManager):
             dbref = int(ostring.strip('#'))
             channels = self.filter(id=dbref)
         except Exception:
+            # Usually because we couldn't convert to int - not a dbref
             pass
         if not channels:
             # no id match. Search on the key.