Fix unit test failures following mocha upgrade

test/red/api/nodes_spec.js

@@ -217,7 +217,7 @@ describe("nodes api", function() {
                     if (module === "foo") {
                         return {
                             name:"foo",
-                            nodes:[{id:123}]
+                            nodes:[{id:"123"}]
                         };
                     }
                 });

test/red/storage/localfilesystem_spec.js

@@ -264,7 +264,7 @@ describe('LocalFileSystem', function() {
     it('should return an empty list of library objects',function(done) {
         localfilesystem.init({userDir:userDir}).then(function() {
             localfilesystem.getLibraryEntry('object','').then(function(flows) {
-                flows.should.eql({});
+                flows.should.eql([]);
                 done();
             }).otherwise(function(err) {
                 done(err);