D11962: Fix problems with unnesesary unsaved empty entries when load worksheet from file

[Alexander Semke]

asemke accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D11962

To: sirgienko, #cantor, asemke
Cc: #cantor, #kde_edu, narvaez, apol
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