fix coin balance params reducer for pending transaction

[ayrat555]

Motivation

We can't extract params from logs params of pending transactions

2019-03-03T18:15:54.317 [error] Task #PID<0.8286.0> started from Indexer.Block.Realtime.Fetcher terminating
** (FunctionClauseError) no function clause matching in anonymous fn/1 in Indexer.Address.CoinBalances.reducer/2
    (indexer) lib/indexer/address/coin_balances.ex:32: anonymous fn(%{address_hash: "0xdac17f958d2ee523a2206206994597c13d831ec7", block_number: nil, data: "0x00000000000000000000000000000000000000000000000000000000007839b0", first_topic: "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", fourth_topic: nil, index: nil, second_topic: "0x00000000000000000000000048686372756193c2663d1081c35d3d48e022c5fa", third_topic: "0x000000000000000000000000a5b1a8d0d45fc9729cc3f57c4f5b8c35da14d6f5", transaction_hash: nil, type: "pending"}) in Indexer.Address.CoinBalances.reducer/2

Changelog

• fix coin balance params reducer for pending transaction

[coveralls]

Pull Request Test Coverage Report for Build 77620a59-7290-411c-9554-c42e2f7943fb

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.06%) to 84.732%

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Totals
Change from base Build 45447395-7b96-46a0-9691-141b5a5ed448:	0.06%
Covered Lines:	4262
Relevant Lines:	5030

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💛 - Coveralls

[vbaranov]

LGTM

[vbaranov]

Something is missing in this comment. I suppose it should be "a log MUST have address_hash and block_number"