fix: Eth RPC: do not occlude block param errors.

[raulk]

Related Issues

RPC methods do not relay the error returned from parseBlkParam. This behaviour loses information and complicates debugging.

Proposed Changes

Wrap the error and make the error string more general since the problem may not be caused by parsing only.

Additional Info

Checklist

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[maciejwitowski]

@raulk this looks good, can you merge this?

[jennijuju]

@raulk this looks good, can you merge this?

Can’t until a lotus maintainer reviews this 😜