fix(cart): 2222 no undefined in notifications

-Bug was 'Removed undefined' appearing instead of 'Removed
[file_name]' when 1 unauthorized file removed. CartService
doesn't have file_name stored, and can't think of a nice
way to get the file name because CartController only has
1 page of names as well. So bandaid solution,
show '1 file' instead of undefined.

Closes #2222

app/scripts/cart/cart.services.ts

@@ -182,7 +182,7 @@ module ngApp.cart.services {
     }
 
     getUnauthorizedFiles(): IFile[] {
-      return this.files.filter((file)=>{
+      return this.files.filter( (file) => {
         return !this.UserService.userCanDownloadFile(file);
       });
     }
@@ -269,7 +269,7 @@ module ngApp.cart.services {
 
     buildAddedMsg(added: Array<Object>, alreadyIn: Array<Object>): string {
       var message = this.gettextCatalog.getPlural(added.length,
-                    "<span>Added <strong class='word-break-all'>" + _.get(_.first(added), "file_name") + "</strong> to the cart.",
+                    "<span>Added <strong class='word-break-all'>" + _.get(_.first(added), "file_name", "1 file") + "</strong> to the cart.",
                     "<span>Added <strong>" + added.length + "</strong> files to the cart.");
 
       if (alreadyIn.length) {
@@ -286,7 +286,7 @@ module ngApp.cart.services {
 
     buildRemovedMsg(removedFiles: IFile[]): string {
       var message = this.gettextCatalog.getPlural(removedFiles.length,
-                    "<span>Removed <strong class='word-break-all'>" + _.get(_.first(removedFiles), "file_name") + "</strong> from the cart.",
+                    "<span>Removed <strong class='word-break-all'>" + _.get(_.first(removedFiles), "file_name", "1 file") + "</strong> from the cart.",
                     "<span>Removed <strong>" + removedFiles.length + "</strong> files from the cart.");
 
       if (removedFiles.length !== 0) {
@@ -306,7 +306,7 @@ module ngApp.cart.services {
           return { remaining: acc.remaining, removed: acc.removed.concat(fileToRemove)};
         }
         return { remaining: acc.remaining.concat(f), removed: acc.removed};
-      } ,{ remaining: [], removed: [] });
+      } , { remaining: [], removed: [] });
       this.lastModifiedFiles = partitioned.removed;
       this.notify.closeAll();
       this.notify({