Bug 568505 - [Help][Search] Often same category is shown multiple times

Fix bug introduced by commit 779b48d505fb884c798172493096bd6a6014918f
(see bug 497048):
In the "Help > Help Contents" window, when in the "Search Results" tab
"Group by Categories" is activated, often the same categories are
displayed multiple times instead of once each.

Change-Id: I23568f92937d1905808c2120b1e331b795d139c4
Signed-off-by: Holger Voormann <eclipse@voormann.de>
1 file changed