Improve test coverage for service/common code

[sh6900]

As a recommendations squad member I need to see 100% test coverage for service/common files So that overall project test coverage is improved

Details and Assumptions

• Below is the current test coverage status

  Name                               Stmts   Miss  Cover   Missing
  ----------------------------------------------------------------
  service/__init__.py                   18      3    83%   31-34
  service/common/error_handlers.py      38     13    66%   32, 38-40, 62-64, 77-79, 107-109
  service/common/log_handlers.py        11      1    91%   35

  • Tests will be added on a new file if necessary
  • Tests will check simulated conditions even if code may not be exercised by app

  Acceptance Criteria

  Given the master branch of recommendations squad
  When I run nosetests on the default copy
  Then I should see 100% coverage for above files and no missing lines

[sh6900]

Not taken up because refactoring to RestX has been dropped