Fixes tags property editor to not submit the html form when pressing enter.

src/Umbraco.Web.UI.Client/src/views/propertyeditors/tags/tags.controller.js

@@ -11,6 +11,10 @@ angular.module("umbraco")
         $scope.addTag = function(e) {
             var code = e.keyCode || e.which;
             if (code == 13) { //Enter keycode   
+
+                //this is required, otherwise the html form will attempt to submit.
+                e.preventDefault();
+                
                 if ($scope.currentTags.indexOf($scope.tagToAdd) < 0) {
                     $scope.currentTags.push($scope.tagToAdd);
                 }

src/Umbraco.Web.UI.Client/src/views/propertyeditors/tags/tags.html

@@ -2,7 +2,7 @@
 		<span ng-repeat="tag in currentTags" ng-click="removeTag(tag)" class="label label-primary tag">{{tag}} <i class="icon icon-delete"></i></span>
 		
 		<input type="text" 
-			ng-keyup="addTag($event)" 
+			ng-keydown="addTag($event)" 
 			placeholder="Type to add tags.." 
 			ng-model="tagToAdd"  />
 </div>