Nethermind client fixes

[ayrat555]

fixes

Retrying.
2019-06-19T12:34:06.538 application=indexer fetcher=block_catchup first_block_number=4583792 last_block_number=4583783 [error] ** (MatchError) no match of right hand side value: false
    (ethereum_jsonrpc) lib/ethereum_jsonrpc/block.ex:78: EthereumJSONRPC.Block.from_response/2
    (elixir) lib/enum.ex:1327: Enum."-map/2-lists^map/1-0-"/2
    (ethereum_jsonrpc) lib/ethereum_jsonrpc/blocks.ex:35: EthereumJSONRPC.Blocks.from_responses/2
    (ethereum_jsonrpc) lib/ethereum_jsonrpc.ex:439: EthereumJSONRPC.fetch_blocks_by_params/3
    (indexer) lib/indexer/block/fetcher.ex:127: Indexer.Block.Fetcher.fetch_and_import_range/2
    (indexer) lib/indexer/block/catchup/fetcher.ex:187: Indexer.Block.Catchup.Fetcher.fetch_and_import_range_from_sequence/3
    (elixir) lib/task/supervised.ex:90: Task.Supervised.invoke_mfa/2
    (elixir) lib/task/supervised.ex:35: Task.Supervised.reply/5
    (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3

Motivation

• Nethermind client has some differences from other clients

Changelog

• fix response without request id

[coveralls]

Pull Request Test Coverage Report for Build 9e3ed368-4cce-4a1c-a6be-1458c993f102

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 80.98%

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Totals
Change from base Build 386557a0-9cf0-4a24-8713-5ca6d5b6b50f:	0.04%
Covered Lines:	5156
Relevant Lines:	6367

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💛 - Coveralls

[pasqu4le]

Just a minor question