Ensure we query for distinct Images

src/omero/gateway/__init__.py

@@ -4222,7 +4222,7 @@ def add_param(param, value):
 
         # Using projection since can't seem to fetch objects AND filter by mapValue
         query = """
-            select obj.id, obj.name from
+            select distinct obj.id from
             %sAnnotationLink ial
             join ial.child ann
             join ann.mapValue mv