This can be the case when spotlight is disabled. So just ignore any
error when trying to locate installed versions and let the user continue
with the manual selection instead of aborting.

Change-Id: I2c4e12652b8cb3b43af3ca6d8d553f0558f91858
Reviewed-on: https://gerrit.libreoffice.org/5069Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>