try {
    var workspacesExtra = {
        localStorage: new Backbone.LocalStorage('workspaces')
    };
} catch (e) {
    var workspacesExtra = {
        fetch: function() {},
        create: function() {}
    };
}
var Workspaces = Backbone.Collection.extend(_({model: Workspace}).extend(workspacesExtra));
var Projects = Backbone.Collection.extend({
    model: Project
});
var Tasks = Backbone.Collection.extend({
    model: Task
});