Not all ethereum nodes will return a message with why something reverted

[wilwade]

Problem

OpenEthereum can be configured to not return the revert error message which tripped up the resolveRegistration code testing for it.

Solution

Removed the check for the error message

with @amparks100

Double Checks:

• [x] Did you update the changelog?
• [x] Any new modules need to be exported?
• [x] Are new methods in the right module?
• [x] Are new methods/modules in core or not (i.e. porcelain or plumbing)?
• [x] Do you have good documentation on exported methods?

Change summary:

• Updated registry.resolveRegistration to support not found cases for nodes that do not return a failure reason.