check if address_id is binary in token_transfers_csv endpoint

[ayrat555]

fixes

2019-07-22T23:24:15.080 [error] #PID<0.9115.250> running BlockScoutWeb.Endpoint (connection #PID<0.9292.250>, stream id 1) terminated
Request: GET /token_transfers_csv?address_id
** (exit) an exception was raised:
    ** (FunctionClauseError) no function clause matching in Explorer.Chain.string_to_address_hash/1
        (explorer) lib/explorer/chain.ex:2097: Explorer.Chain.string_to_address_hash(nil)
        (block_scout_web) lib/block_scout_web/controllers/address_transaction_controller.ex:114: BlockScoutWeb.AddressTransactionController.token_transfers_csv/2
        (block_scout_web) lib/block_scout_web/controllers/address_transaction_controller.ex:1: BlockScoutWeb.AddressTransactionController.action/2
        (block_scout_web) lib/block_scout_web/controllers/address_transaction_controller.ex:1: BlockScoutWeb.AddressTransactionController.phoenix_controller_pipeline/2
        (block_scout_web) lib/block_scout_web/endpoint.ex:1: BlockScoutWeb.Endpoint.instrument/4
        (phoenix) lib/phoenix/router.ex:275: Phoenix.Router.__call__/1
        (block_scout_web) lib/block_scout_web/endpoint.ex:1: BlockScoutWeb.Endpoint.plug_builder_call/2
        (block_scout_web) lib/block_scout_web/endpoint.ex:1: BlockScoutWeb.Endpoint."call (overridable 3)"/2

Changelog

• check if address_id is binary in token_transfers_csv endpoint

[coveralls]

Pull Request Test Coverage Report for Build e0b97f8d-073c-4713-b782-a6c5f092acaf

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 5 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.06%) to 79.521%

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Files with Coverage Reduction	New Missed Lines	%
apps/block_scout_web/lib/block_scout_web/controllers/address_transaction_controller.ex	2	80.65%
apps/block_scout_web/lib/block_scout_web/controllers/chain_controller.ex	3	86.36%

Totals
Change from base Build 62cf5e91-d0c8-4e59-9d44-a733b166f1fb:	0.06%
Covered Lines:	5145
Relevant Lines:	6470

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build c6d7500e-c26f-40df-af2e-517c5f043873

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.459%

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Totals
Change from base Build 62cf5e91-d0c8-4e59-9d44-a733b166f1fb:	0.0%
Covered Lines:	5145
Relevant Lines:	6475

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💛 - Coveralls