Instance Checker

[masfaraud]

• Dessia Object method for check is_valid? -> implement for subclass of DessiaObject
• Check Block in workflow that stops run but do not raise error?

Should we give to users some class to throw "errors" rather than True/False -> Warnings, traceback and context of error

[masfaraud]

Implement "error" classes and tests to easily produce the error

[masfaraud]

default implementation: check types of attributes?

[GhislainJ]

Some first base features have been added. We should split this issue into sub-issues to have a good tracking. I keep this open but move it to "Not assigned" milestone