[PUSHED] add method isEmpty() to OUStringBuffer

[Norbert Thiebaud (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/2017

Approvals:
  Norbert Thiebaud: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: Ia11d97eebbb08e8058a5f919ed3db3029ce39a78
Gerrit-PatchSet: 2
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Christina Roßmanith <ChrRossmanith at web.de>
Gerrit-Reviewer: Norbert Thiebaud <nthiebaud at gmail.com>