CMake: Report an error when project can not get parsed

Report an error when a project can not get parsed.

Change-Id: I659a5ffb465b4a2de39910b05e7eef2481b9ad70
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

src/plugins/cmakeprojectmanager/builddirmanager.cpp

@@ -196,6 +196,12 @@ void BuildDirManager::setParametersAndRequestParse(const BuildDirParameters &par
                                                    int newReaderReparseOptions,
                                                    int existingReaderReparseOptions)
 {
+    if (!parameters.cmakeTool) {
+        TaskHub::addTask(Task::Error,
+                         tr("The kit needs to define a CMake tool to parse this project."),
+                         ProjectExplorer::Constants::TASK_CATEGORY_BUILDSYSTEM);
+        return;
+    }
     QTC_ASSERT(parameters.isValid(), return);
 
     if (m_reader)