handle failed assessment creation with helpful info
Feature Description
when the assessmentcreation fails, the user needs to be shown helpful and accurate info.
Motivation and Context
e.g. we should be wary of just telling them to try again. trying costs ether and they have lost it if the tx failed.
-> we should only offer a retry button, if we think that won't happen again.
Related Issues
resolves #244
Edited by Antoine Estienne