Navigation arrows of the document details view do not work when a search result is displayed

Description

In Alfresco Exporer an error occurs when the previous or next navigation arrow of the document details dialog is used to display the next item of a result list.

Steps to reproduce

1. Log into Alfresco Explorer
2. Perform a search (no matter if simple or advanced search) which gets at least two results
3. Click on the "View Details" button of the first result to display the document details view
4. Click on the next navigation arrow

Expected Behaviour

The next result of the list should be displayed in the document details view

Observed Behaviour

An exception occurs as per the attached screenshot and log trace.

Analysis to date

Line717 of org.alfresco.web.bean.content.DocumentDetailsDialog.nextItem() the sort column could not be retrieve and return null

this.browseBean.getContentRichList().getCurrentSortColumn()

Then the exception is thrown when calling Collections.sort() with a null property name (line719).

This error can't be reproduced in 4.1.4 nor 4.0.2