D24955: Fix sagemath backend when there is no sage-env

[Antonio Rojas]

arojas created this revision.
arojas added a reviewer: sirgienko.
Herald added a project: KDE Edu.
Herald added a subscriber: kde-edu.
arojas requested review of this revision.

REVISION SUMMARY
  Since sagemath 8.9 it is possible to run sage without sourcing sage-env (https://trac.sagemath.org/ticket/28225) so don't abort if it is not present.

TEST PLAN
  sagemath backend works in Arch Linux (which doesn't ship sage-env)

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D24955

AFFECTED FILES
  src/backends/sage/cantor-execsage

To: arojas, sirgienko
Cc: kde-edu, narvaez, apol
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