The cleanest fix is to add a description attribute to ugroup before the multi-modify

Added a description attribute to ugroup to ensure DELETE modification succeeds.

Author: vharseko

opendj-server-legacy/src/test/java/org/opends/server/plugins/ReferentialIntegrityPluginTestCase.java

@@ -1872,7 +1872,10 @@ public void testEnforceIntegrityModifyGroupAddMissingUniqueMemberWithPriorDelete
     addAttrEntry(configDN, dsConfigAttrFiltMapping,
                            "uniquemember:(objectclass=person)");
     replaceAttrEntry(configDN, "ds-cfg-enabled", "true");
-
+    
+    // Ensure 'description' exists on ugroup so the DELETE modification succeeds.
+    addAttrEntry(DN.valueOf(ugroup), "description", "test description");
+    
     // Build a modify request with a non-ADD/REPLACE modification first,
     // followed by an ADD of a uniquemember referencing a missing DN.
     final ModifyRequest modifyRequest = Requests.newModifyRequest(DN.valueOf(ugroup));