WelcomePage: Make welcome page more resilient

Do not try to open non-existant project files when asked to open
an example.

Change-Id: Ibcd106a0a8354f98998e61cafa3f5cd2ce2844b0
Reviewed-by: Daniel Molkentin <daniel.molkentin@nokia.com>

src/plugins/qtsupport/gettingstartedwelcomepage.cpp

@@ -401,6 +401,9 @@ void ExamplesWelcomePage::openProject(const QString &projectFile, const QStringL
 
     QStringList filesToOpen = additionalFilesToOpen;
     QFileInfo proFileInfo(proFile);
+    if (!proFileInfo.exists())
+        return;
+
     // If the Qt is a distro Qt on Linux, it will not be writable, hence compilation will fail
     if (!proFileInfo.isWritable())
         proFile = copyToAlternativeLocation(proFileInfo, filesToOpen, dependencies);