If a user has a page open for editing in pages app and the page is deleted by another user, a strange error is shown to the user (see below).

Error:
RpcInvocationException: Unable to invoke method closeTab in com.vaadin.shared.ui.tabsheet.TabsheetServerRpc
caused by InvocationTargetException
caused by CacheUpdateException: Error during Table cache update.
caused by MgnlInstantiationException: Failed to create instance of [class info.magnolia.contenttags.form.field.TagFieldFactory]
caused by MgnlInstantiationException: Unable to resolve parameters [Item at 1] of ctor [TagFieldFactory(TagFieldDefinition, Item, UiContext, I18NAuthoringSupport, TagManager, TagsModule, SimpleTranslator)]

Steps to reproduce on demoauthor:

• LogIn with user Peter
• Create a page in pages app
• Open this page for editing in pages app
• Log in with user superuser on a different browser
• Delete the page created by Peter and publish the deletion
• User Peter now sees the error message above (at least after he tries to Close the tab)

If superuser is logged in both browsers, then a different message is displayed ("Page was removed").