Crash: Fix crash when importing broken Qt versions

Fix a crash when importing a build, using a qmake that is broken.

I ran into this crash with a 32bit qmake used in a pure 64bit userland.

Change-Id: I08acb8d5f2cd72c873a30be5e45324f6daef702c
Reviewed-on: http://codereview.qt.nokia.com/2181


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Daniel Teske <daniel.teske@nokia.com>

src/plugins/qt4projectmanager/qt4projectconfigwidget.cpp

@@ -370,7 +370,7 @@ void Qt4ProjectConfigWidget::updateImportLabel()
                         newVersion = QtSupport::QtVersionFactory::createQtVersionFromQMakePath(qmakePath);
                         mustDelete = true;
                     }
-                    targetMatches = newVersion->supportsTargetId(m_buildConfiguration->target()->id());
+                    targetMatches = newVersion ? newVersion->supportsTargetId(m_buildConfiguration->target()->id()) : false;
                     if (mustDelete)
                         delete newVersion;
                 } else {