<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def create_notebook(self, model=None, path=''):
 """Create a new notebook and return its model with no content."""

        path = path.strip('/')
        if model is None:
            model = {}
        if 'content' not in model:
            metadata = current.new_metadata(name=u'')
            model['content'] = current.new_notebook(metadata=metadata)
        if 'name' not in model:
            model['name'] = self.increment_filename('Untitled', path)

        model['path'] = path
        model['type'] = 'notebook'
        model = self.save_notebook(model, model['name'], model['path'])

        return model