add last_block_number=0 for empty node and db

[ayrat555]

Motivation

fixes

** (FunctionClauseError) no function clause matching in Indexer.Block.Catchup.BoundIntervalSupervisor.handle_info/2
    (indexer) lib/indexer/block/catchup/bound_interval_supervisor.ex:181: Indexer.Block.Catchup.BoundIntervalSupervisor.handle_info({#Reference<0.1083520497.830210051.41795>, %{first_block_number: 0, missing_block_count: 0, shrunk: false}}, %Indexer.Block.Catchup.BoundIntervalSupervisor{bound_interval: %Indexer.BoundInterval{current: 2500, maximum: 25000, minimum: 2500}, fetcher: %Indexer.Block.Catchup.Fetcher{block_fetcher: %Indexer.Block.Fetcher{broadcast: :catchup, callback_module: Indexer.Block.Catchup.Fetcher, json_rpc_named_arguments: [transport: EthereumJSONRPC.HTTP, transport_options: [http: EthereumJSONRPC.HTTP.HTTPoison, url: "http://localhost:7545", http_options: [recv_timeout: 60000, timeout: 60000, hackney: [pool: :ethereum_jsonrpc]]], variant: EthereumJSONRPC.Ganache], receipts_batch_size: 250, receipts_concurrency: 10}, blocks_batch_size: 10, blocks_concurrency: 10, memory_monitor: Indexer.Memory.Monitor}, memory_monitor: nil, task: %Task{owner: #PID<0.1072.0>, pid: #PID<0.1073.0>, ref: #Reference<0.1083520497.830210051.41795>}})
    (stdlib) gen_server.erl:637: :gen_server.try_dispatch/4
    (stdlib) gen_server.erl:711: :gen_server.handle_msg/6
    (stdlib) proc_lib.erl:249: :proc_lib.init_p_do_apply/3
Last message: {#Reference<0.1083520497.830210051.41795>, %{first_block_number: 0, missing_block_count: 0, shrunk: false}}
State: %Indexer.Block.Catchup.BoundIntervalSupervisor{bound_interval: %Indexer.BoundInterval{current: 2500, maximum: 25000, minimum: 2500}, fetcher: %Indexer.Block.Catchup.Fetcher{block_fetcher: %Indexer.Block.Fetcher{broadcast: :catchup, callback_module: Indexer.Block.Catchup.Fetcher, json_rpc_named_arguments: [transport: EthereumJSONRPC.HTTP, transport_options: [http: EthereumJSONRPC.HTTP.HTTPoison, url: "http://localhost:7545", http_options: [recv_timeout: 60000, timeout: 60000, hackney: [pool: :ethereum_jsonrpc]]], variant: EthereumJSONRPC.Ganache], receipts_batch_size: 250, receipts_concurrency: 10}, blocks_batch_size: 10, blocks_concurrency: 10, memory_monitor: Indexer.Memory.Monitor}, memory_monitor: nil, task: %Task{owner: #PID<0.1072.0>, pid: #PID<0.1073.0>, ref: #Reference<0.1083520497.830210051.41795>}}

Changelog

• add last_block_number=0 for empty node and db

[coveralls]

Pull Request Test Coverage Report for Build 5a5cfe10-f419-489c-87fc-6b48fe47c118

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 76.762%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/indexer/lib/indexer/block/catchup/fetcher.ex	0	1	0.0%

Totals
Change from base Build c046cd9f-d338-4db2-ae9c-99c150937a2a:	0.0%
Covered Lines:	5282
Relevant Lines:	6881

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💛 - Coveralls

[vbaranov]

Successfully tested with Ganache-cli.