Docker: Fix shell exit handling

Previously if a docker container was removed outside of Qt Creator
the shell would not be correctly reset by the dockerdevice and
therefor cause a hang.

Change-Id: I5e84f7c114e525c732f45b701277736d6acc7a11
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/libs/utils/deviceshell.cpp

@@ -98,6 +98,7 @@ RunResult DeviceShell::run(const CommandLine &cmd, const QByteArray &stdInData)
 
     const RunResult errorResult{-1, {}, {}};
     QTC_ASSERT(m_shellProcess, return errorResult);
+    QTC_ASSERT(m_shellProcess->isRunning(), return errorResult);
     QTC_ASSERT(m_shellScriptState == State::Succeeded, return errorResult);
 
     QMutexLocker lk(&m_commandMutex);