Minor typos fixed

Heh, right! My mistake.

On 7 November 2014 10:26, Markus Unterwaditzer <notifications@github.com>
wrote:

> In flask/helpers.py:
>
> > @@ -214,7 +214,7 @@ def external_url_handler(error, endpoint, values):
> >              # Here, lookup_url is some utility function you've built
> >              # which looks up the endpoint in some external URL registry.
> >              url = lookup_url(endpoint, **values)
> > -            if url is None:
> > +            if url is ``None``:
>
> Uh, that's code.
>
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> <https://github.com/mitsuhiko/flask/pull/1243/files#r20001024>.
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