Merge pull request #8931 from Microsoft/tsserver-projectsystem-tests

initial revision of unit test support for project system in tsserver

src/server/editorServices.ts

@@ -1138,7 +1138,7 @@ namespace ts.server {
             else {
                 this.log("No config files found.");
             }
-            return {};
+            return configFileName ? { configFileName } : {};
         }
 
         /**