make warnings an array that angularJS can watch

src/Umbraco.Web.UI.Client/src/common/directives/components/content/edit.controller.js

@@ -348,7 +348,7 @@
                                 var tokens = [iVariant.language.name];
                                 
                                 localizationService.localize("publish_contentPublishedFailedByMissingName", tokens).then(function (value) {
-                                    iVariant.warnings = {"message": value};
+                                    iVariant.warnings = [{"message": value}];
                                 });
                                 
                                 return $q(function(resolve, reject) {

src/Umbraco.Web.UI.Client/src/views/content/overlays/publish.controller.js

@@ -105,6 +105,11 @@
 
 
             vm.variants = $scope.model.variants;
+            
+            // create warnings array for each variant. This is needed for angular to watch the array.
+            _.forEach(vm.variants, function(varaint) {
+                varaint.warnings = [];
+            });
 
             if (!$scope.model.title) {
                 localizationService.localize("content_readyToPublish").then(function (value) {