quietly ignore nil validator updates, without erroring, to avoid blocking icq #488
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1. Summary
Fixes bug where nil validator response is received (query was made for validator that does not exist, valid nil proof delivered) but validator cannot be deleted so bil is never valid from a cosmos PoV.
2.Type of change
3. Implementation details
On receipt of
nil
validatorResponse, log error and return nil to allow further messages to be processed.