[INTERNAL] removed exception handling

We are currently facing following problem in our STF regression

TRACE 04:15:44,156 [RMI TCP Connection(3)-192.168.66.131]
(ContextMenusInSessionArea.java:65) clicking on context menu item:
Restrict to Read-Only Access
TRACE 04:15:44,193 [main] (ContextMenuHelper.java:148) found context
menu item: Grant Write Access[enabled=false]
TRACE 04:15:44,194 [main] (ContextMenuHelper.java:148) found context
menu item: Restrict to Read-Only Access[enabled=false]

As we are unable to reproduce this behavior locally the exception
handling is removed because one of catch block silently disable this
action.

Change-Id: I79b3f7f569f4030fffe0f40c043409ef3d4ee329
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1586
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>