D11588: Fix broken octave backend and debug messages small change

[Nikita Sirgienko]

sirgienko added a comment.


  Sorry, my mistake.
  Now, we haven't segmentation fault, but we also haven't any output from `octave-cli`.
  It looks like this:
  F5766049: изображение.png <https://phabricator.kde.org/F5766049>

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D11588

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