Improve worklist_viewentry.xhtml

[rsoika]

In some cases the worklist_viewentry.xhtml throws a EL Exception because of the following expression using the contains method:

<h:panelGroup layout="block" style=""
 rendered="#{workitem.item['$workflowabstract'].contains('imixs-view-details')}">
<h:outputText escape="false" value="#{workitem.item['$workflowabstract']}" />
</h:panelGroup>

This issue occurs because the item '$workflowabstract' sometimes contains a Long value instead of a String value, and the Long class doesn't have a contains() method.