[PUSHED] handle the empty URL case in file picker

[Andras Timar (via Code Review)]

Hi,

Thank you for your patch!  It has been merged to LibreOffice.

If you are interested in details, please visit

    https://gerrit.libreoffice.org/2390

Approvals:
  Andras Timar: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: Icf71142411a79e1fe2d1d5918d2a400b174acc00
Gerrit-PatchSet: 5
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Gergő Mocsi <gmocsi91 at gmail.com>
Gerrit-Reviewer: Andras Timar <atimar at suse.com>
Gerrit-Reviewer: Chris Sherlock <chris.sherlock79 at gmail.com>