D11524: lldb: don't issue command when there's no env variables to set, fix Bug 391897

[Aleix Pol Gonzalez]

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

REPOSITORY
  R32 KDevelop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11524

To: qi437103, apol, #kdevelop
Cc: kdevelop-devel
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