🔧 Better Errors

[gluax]

🔧 Chore

Add in some more error messages for convenience.

Motivation

This is for more easily understandable/readable error messages.

For example, currently, if you try to load a nonexistent DR you just get an error with the bytes of the dr_id and a message "not found" in a JSON blob.

Sometimes, this is enough, but was the DR not found in the timeouts, status, or somewhere else? This information would be helpful for people calling contract methods, likely mostly us for debugging purposes.

However, it's a helpful change and doesn't take much effort.