Blank line fixes related to previous regressions

There were 3 wrongly indented return statements introduced in pep8
pull request [1], then they were fixed again but they were still
missing the blank lines that caused pblaho's autoindenter to indent
the return statements wrong. This commit adds those blank lines.

[1] https://github.com/tuskar/tuskar/pull/52
Do not raise exception when Heat credentials are not configured

This should help tests to pass. The exception is still being logged
into Tuskar log, but it is not fatal.
Merge pull request #60 from jistr/bug/pep8_patch_regressions

Blank line fixes related to previous regressions
Merge pull request #62 from mfojtik/heat_tests

Do not raise exception when Heat credentials are not configured
Add heat sample config to docs.
Add username/pass to heat client
Merge pull request #66 from mtaylor/heat_creds

Heat creds
Merge pull request #65 from jguiditta/docs

Add heat sample config to docs.