The QSslCertificate ctor is somewhat expensive, especially when we are shutting down. By using optional<> we simply reset() it and no longer need to create a new, valid, certificate. Task-number: QTBUG-102474 Change-Id: I514433b0d380dd3ceabbed3a6164f7e3efc490c7 Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io> Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Konrad Kujawa <konrad.kujawa@qt.io> (cherry picked from commit 61bfe87a64ca322de0ebf9bf61a0a0a81ee5bf7d) Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
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