fixes null check on linkpicker changes with anchors, fixes ng-true-value constant value

src/Umbraco.Web.UI.Client/src/common/services/tinymce.service.js

@@ -761,9 +761,14 @@ function tinyMceService($log, imageHelper, $http, $timeout, macroResource, macro
 		 * @param {string} input the string to parse      
 		 */
 		getAnchorNames: function (input) {
-			var anchorPattern = /<a id=\\"(.*?)\\">/gi;
+            var anchors = [];
+            if (!input) {
+                return anchors;
+            }
+                
+		    var anchorPattern = /<a id=\\"(.*?)\\">/gi;
 			var matches = input.match(anchorPattern);
-			var anchors = [];
+			
 
 			if (matches) {
 				anchors = matches.map(function (v) {

src/Umbraco.Web.UI.Client/src/views/common/overlays/linkpicker/linkpicker.html

@@ -34,7 +34,7 @@
         <label class="checkbox no-indent">
             <input type="checkbox"
                    ng-model="model.target.target"
-                   ng-true-value="_blank"
+                   ng-true-value="'_blank'"
                    ng-false-value="" /> <localize key="defaultdialogs_openInNewWindow">Opens the linked document in a new window or tab</localize>
         </label>
     </umb-control-group>