Error "ERR_RITUAL_NOT_FINALIZED" is thrown when the ritual is actually expired

[manumonti]

The problem

If we try to encrypt something using an expired ritual, we will get something similar to:

/Users/manumonti/Projects/nucypher/taco-web/packages/taco/src/dkg.ts:169
      throw new Error(ERR_RITUAL_NOT_FINALIZED(ritualId, ritual));
            ^
Error: Ritual 0 is not finalized. State: 6

But the state number 6 corresponds to an expired ritual.

The suggested solution

• Rename this error from ERR_RITUAL_NOT_FINALIZED to ERR_RITUAL_NOT_VALID.
• Change the error description from Ritual ${ritualId} is not finalized. State: ${ritual.state} to Ritual ${ritualId} is not valid. State: ${ritual.state}
• [Optional] Parse the ritual state to a description: 6 -> EXPIRED, 4-> DKG_INVALID, etc.