[PUSHED] fdo#43460 startmath,codemaker: use isEmpty()

[Noel Power (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/4318

Approvals:
  Noel Power: Verified; Looks good to me, approved
  Marcos Souza: Looks good to me, but someone else must approve


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To view, visit https://gerrit.libreoffice.org/4318
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Gerrit-MessageType: merged
Gerrit-Change-Id: I55d3f4546f40a321ebf4b08db33536592f451944
Gerrit-PatchSet: 2
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Jelle van der Waa <jelle at vdwaa.nl>
Gerrit-Reviewer: Marcos Souza <marcos.souza.org at gmail.com>
Gerrit-Reviewer: Noel Power <noel.power at suse.com>