ClearCase: Check if ClearCase command is executable

Change-Id: I8e873fcb1bdc3543a031a55b8e027a574a101752
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/clearcase/clearcaseplugin.cpp

@@ -379,6 +379,8 @@ bool ClearCasePlugin::initialize(const QStringList & /*arguments */, QString *er
 
     m_settings.fromSettings(ICore::settings());
 
+    QTC_CHECK(QFileInfo(m_settings.ccBinaryPath).isExecutable());
+
     // update view name when changing active project
     if (ProjectExplorerPlugin *pe = ProjectExplorerPlugin::instance())
         connect(pe, SIGNAL(currentProjectChanged(ProjectExplorer::Project*)),