Updating log message for empty reverse mapping

src/main/java/datawave/query/util/MetadataHelper.java

@@ -538,7 +538,7 @@ public QueryModel getQueryModel(String modelTableName, String modelName, Collect
                 log.trace("empty query model for {}", this);
             }
             if ("DatawaveMetadata".equals(modelTableName)) {
-                log.error("Query Model should not be empty...");
+                log.warn("Query Model {} has no reverse mappings", modelName);
             }
         }