Removed the trailing newline from widget attrs.html template.
The solution may be revisited by fixing refs #9198 but not
for Django 1.11.
Thanks Dmitry Ivanchenko for the report and Preston Timmons for advice.
This is preparation for landing the template-based widget rendering
patch and goes a long way to making these tests more useful for future
development. The old doctest heritage is strong here.
chillaranand
Dmitry
Preston Timmons