Fix for Adobe Elvis Implementation on Metadata object

For some reason, on all Adobe engines, the use of the elvis on the metadata object throws `mdLabels` is undefined on 991

system/BaseSpec.cfc

@@ -987,7 +987,7 @@ component {
 			// init consolidated spec labels
 			var consolidatedLabels = arguments.spec.labels;
 			var md                 = getMetadata( this );
-			var mdLabels           = md.labels ?: "";
+			var mdLabels           = structKeyExists( md, "labels" ) ? md.labels : "";
 			consolidatedLabels.append( listToArray( mdLabels ), true );
 			// Build labels from nested suites, so suites inherit from parent suite labels
 			var parentSuite = arguments.suite;