show working tree when looking at a blob

contour.html

@@ -98,7 +98,12 @@ console.log(data);
         } 
 
         // BEGIN TREE
-        var path = this_url.searchParams.get("path");
+        if (blob) {
+            var path = this_url.searchParams.get("path");
+            path = path.split('/').slice(0, -1).join('/');
+        } else {
+            var path = this_url.searchParams.get("path");
+        }
         const tree_elt = document.querySelector('#tree');
         if(path) {
             var tree_url = "https://gitlab.constantvzw.org/api/v4/projects/456/repository/tree?path=" + path;