Error out on missing body in token middleware

[smichel17]

Currently it will just throw.

Checklist

• I have read the CONTRIBUTING guidelines.
• I have added test cases which verify the correct operation of this feature or patch.
• I have added documentation pertaining to this feature or patch.
• The automated test suite ($ make test) executes successfully.
• The automated code linting ($ make lint) executes successfully.

[coveralls]

Coverage increased (+0.0002%) to 99.79% when pulling 1be83ad on smichel17:patch-1 into 1105760 on jaredhanson:master.