Don't add build steps for projects without buildconfigurations

src/plugins/projectexplorer/buildmanager.cpp

@@ -332,9 +332,11 @@ void BuildManager::buildProjects(const QList<Project *> &projects, const QList<Q
     end = projects.constEnd();
 
     for (it = projects.constBegin(); it != end; ++it, ++cit) {
-        QList<BuildStep *> buildSteps = (*it)->buildSteps();
-        foreach (BuildStep *bs, buildSteps) {
-            buildQueueAppend(bs, *cit);
+        if (*cit != QString::null) {
+            QList<BuildStep *> buildSteps = (*it)->buildSteps();
+            foreach (BuildStep *bs, buildSteps) {
+                buildQueueAppend(bs, *cit);
+            }
         }
     }
     startBuildQueue();