Safe readdir() use for pathMaps

js/project/node.js

@@ -100,6 +100,7 @@ define([
       }, done)
     },
     readdir: function(done) {
+      if (!this.isDir) return done();
       //TODO: track entries, compare to existing, do not duplicate
       var self = this;
       var reader = this.entry.createReader();

js/project/tree.js

@@ -36,10 +36,10 @@ define([
         //after initial render, do the walk for path lookup
         root.walk(function(node, c) {
           pathMap[node.entry.fullPath] = node;
-          //make sure the children are read and populated
-          node.readdir(function() {
-            c();
-          });
+          //make sure the children are read and populated, then continue
+          if (node.isDir) {
+            node.readdir(c);
+          } else c();
         });
       });
       setVisible();