repos: fix field form validation exception checking - it seems wrong to checking the exception type Found by pylint. Will probably give better error messages in some cases.

babel >= 0.9.6, < 2.4
waitress >= 0.8.8, < 1.0
pytest ~= 3.0
pytest-runner
pytest-sugar>=0.7.0
pytest-catchlog
pytest-localserver
mock
sphinx
webtest < 3