D12175: Check for valid _foregroundProcessInfo to prevent crash

[Kurt Hindenburg]

hindenburg added reviewers: Konsole, hindenburg.

REPOSITORY
  R319 Konsole

REVISION DETAIL
  https://phabricator.kde.org/D12175

To: ahmadsamir, #konsole, hindenburg
Cc: #konsole, herrold, ngraham, hindenburg
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