support same directory in Twig namespace json

Author: Haehnchen

src/main/java/fr/adrienbrault/idea/symfony2plugin/templating/path/JsonFileIndexTwigNamespaces.java

@@ -91,7 +91,7 @@ public Result<Collection<TwigPath>> compute() {
 
             for(TwigPathJson twigPath : configJson.getNamespaces()) {
                 String path = twigPath.getPath();
-                if(path == null) {
+                if(path == null || path.equals(".")) {
                     path = "";
                 }