Always allow attachment upload for new work packages

af73d60773
introduced a check whether the work package contains a link addAttachment
(i.e., the user is allowed to :edit_work_packages).

For new work packages, this link is not available, thus we need to
provide some alternative as for now, when adding work packages it is
always possible to add attachments (given the :add_work_packages permission).

frontend/app/services/work-package-service.js

@@ -82,6 +82,7 @@ module.exports = function($http,
     initializeWorkPackage: function(projectIdentifier, initialData) {
       var changes = _.clone(initialData);
       var wp = {
+        isNew: true,
         embedded: {},
         props: {},
         links: {

frontend/app/work_packages/directives/work-package-attachments-directive.js

@@ -69,7 +69,7 @@ module.exports = function(
     scope.rejectedFiles = [];
     scope.size = ConversionService.fileSize;
 
-    scope.hasRightToUpload = !!workPackage.links.addAttachment;
+    scope.hasRightToUpload = !!(workPackage.links.addAttachment || workPackage.isNew);
 
     var currentlyRemoving = [];
     scope.remove = function(file) {