EAGLESIX-3006: Added return (only missing code) to shallowClone().

lib/pipeline/matcher/AndMatchExpression.js

@@ -78,5 +78,7 @@ proto.shallowClone = function shallowClone( /*  */ ){
 	for (var i = 0; i < this.numChildren(); i++) {
 		e.add(this.getChild(i).shallowClone());
 	}
+
+	return e; // Return the shallow copy.
 };