Don't allow 3-box with only two boxes in room. Resolve #2206.

CHANGELOG.md

@@ -101,6 +101,8 @@ without arguments starts a full interactive Python console.
 - New EvMenu templating system for quickly building simpler EvMenus without as much code.
 - Add `Command.client_height()` method to match existing `.client_width` (stricako)
 - Include more Web-client info in `session.protocol_flags`.
+- Fixes in multi-match situations - don't allow finding/listing multimatches for 3-box when
+  only two boxes in location.
 
 
 ## Evennia 0.9 (2018-2019)

evennia/objects/manager.py

@@ -471,7 +471,12 @@ class ObjectDBManager(TypedObjectManager):
                 matches = _searcher(searchdata, candidates, typeclass, exact=exact)
 
         # deal with result
-        if len(matches) > 1 and match_number is not None:
+        if len(matches) == 1 and match_number is not None and match_number != 0:
+            # this indicates trying to get a single match with a match-number
+            # targeting some higher-number match (like 2-box when there is only
+            # one box in the room). This leads to a no-match.
+            matches = []
+        elif len(matches) > 1 and match_number is not None:
             # multiple matches, but a number was given to separate them
             if 0 <= match_number < len(matches):
                 # limit to one match