D11963: Add parsing errors in lua backend

[Nikita Sirgienko]

sirgienko created this revision.
sirgienko added reviewers: Cantor, asemke.
sirgienko added a project: Cantor.
Restricted Application added a subscriber: KDE Edu.
Restricted Application added a project: KDE Edu.
sirgienko requested review of this revision.

REVISION SUMMARY
  Luabackend haven't parsed errors, so if entries cause errors, we just get empty output (but not empty error output, which don't check). This add error handling, so now we could see, if errors hapened.

TEST PLAN
  1. Start lua session, and check, that wrong lua expression don't produce any output.
  2. Apply this patch
  3. Check, that how wrong lua expression produce output and cause error entry status

REPOSITORY
  R55 Cantor

REVISION DETAIL
  https://phabricator.kde.org/D11963

AFFECTED FILES
  src/backends/lua/luaexpression.cpp
  src/backends/lua/luaexpression.h
  src/backends/lua/luasession.cpp

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