Error management in USM

[leodarkseid]

the repo currently as a const.py module that contains errors. but the r'^user/register$', r'^user/login$',r'^user/sendregisteremail$', and r'^user/login$', all give the same response 200 in most scenarios, even when no data is passed and an error 400 is expected, that makes it a little harder to tell if requests are successful or not

[romain-fontugne]

Thanks! are you planning to fix this?

[leodarkseid]

Yes, I will

[leodarkseid]

@romain-fontugne not sure if this should be closed as it should be a continuous development, and it will be nice to have automated test to ensure future pull request don't break anything