Fix View methods

[jasonvarga]

The template method was treating a null argument as getter so you couldn't do View::make() without an argument.

Normally you'd do View::make('foo') but if you wanted to specify the template fluently (maybe because it's a long name and looked tidier) you couldn't. Now you can.

View::make()
  ->template('foo/bar/baz/qux')
  ->with(['foo' => 'bar']);