Adds $tw.utils.decodeURISafe and $tw.utils.decodeURIComponentSafe (#5999)

* call self.displayError

* Revert "call self.displayError"

This reverts commit 5d599aa979.

* fixes decodeURI & decodeURIComponent

core/modules/utils/utils.js

@@ -969,4 +969,22 @@ exports.makeCompareFunction = function(type,options) {
 	return (types[type] || types[options.defaultType] || types.number);
 };
 
+exports.decodeURIComponentSafe = function(str) {
+	var value = str;
+	try {
+		value = decodeURIComponent(str);
+	} catch(e) {
+	}
+	return value;
+};
+
+exports.decodeURISafe = function(str) {
+	var value = str;
+	try {
+		value = decodeURI(str);
+	} catch(e) {
+	}
+	return value;
+};
+
 })();