Maemo: Don't try to re-run run control when run configuration is gone.

Quick fix for 2.1.
Proper fix is to copy all relevant information at run control creation time.

Task-number: https://projects.maemo.org/bugzilla/show_bug.cgi?id=203698
Reviewed-by: dt

src/plugins/qt4projectmanager/qt-maemo/maemoruncontrol.cpp

@@ -71,6 +71,8 @@ void MaemoRunControl::start()
 {
     if (!m_devConfig.isValid()) {
         handleError(tr("No device configuration set for run configuration."));
+    } else if (!m_runConfig) {
+        handleError(tr("Run configuration no longer available."));
     } else {
         m_running = true;
         emit started();

src/plugins/qt4projectmanager/qt-maemo/maemoruncontrol.h

@@ -39,6 +39,7 @@
 
 #include <projectexplorer/runconfiguration.h>
 
+#include <QtCore/QPointer>
 #include <QtCore/QString>
 
 namespace Qt4ProjectManager {
@@ -71,7 +72,7 @@ private:
     void setFinished();
     void handleError(const QString &errString);
 
-    MaemoRunConfiguration *m_runConfig; // TODO this pointer can be invalid
+    QPointer<MaemoRunConfiguration> m_runConfig;
     const MaemoDeviceConfig m_devConfig;
     MaemoSshRunner * const m_runner;
     bool m_running;