Debugger: Avoid crashes when no C++-engine is available.
Check for valid runcontrols in various places and initialize m_engine correcly. In the case of QML-Debugging, handle NoEngineType. Reviewed-by: Leandro T. C. Melo <email@example.com> Reviewed-by: Kai Koehne <firstname.lastname@example.org> Task-number: QTCREATORBUG-2086
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