Aftervalidator compare against null field

When using this validator to compare against another field in the model, if that field is null the validator will fail

Author: nockhigan

models/validators/AfterValidator.cfc

@@ -58,6 +58,11 @@ component
 				"get#arguments.validationData#"
 			);
 		}
+		
+		// return true if no value to compare against
+		if ( isNull( compareValue ) || isNullOrEmpty( compareValue ) ) {
+			return true;
+		}
 
 		/**
 		 * -1 if date1 is before than date2