D5084: fix a crash caused by bad disconnects during debug install cancellation

[Aleix Pol Gonzalez]

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

REPOSITORY
  R120 Plasma Workspace

BRANCH
  drkonqi-cancel-crash

REVISION DETAIL
  https://phabricator.kde.org/D5084

To: sitter, apol
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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