Fix broken call of fallback function and call of Gnosis contract methods with parameters

[vbaranov]

Motivation

1. Call of a contract's fallback function returns an alert

2. Calls of GnosisProxy contract functions with parameters return the error:

2020-11-17T16:50:13.031 [error] #PID<0.6835.0> running BlockScoutWeb.Endpoint (connection #PID<0.6713.0>, stream id 9) terminated
Request: GET /smart-contracts/0x52a0110990C2047B1354b53Ef576f93f471D124F?function_name=isOwner&method_id=2f54bf6e&args%5B%5D=0xBDFdb9F56e7E11D51DB3c80604D09970C97445Fa
** (exit) an exception was raised:
    ** (MatchError) no match of right hand side value: nil
        (explorer 0.0.1) lib/explorer/smart_contract/reader.ex:353: Explorer.SmartContract.Reader.query_function/3
        (block_scout_web 0.0.1) lib/block_scout_web/controllers/smart_contract_controller.ex:95: BlockScoutWeb.SmartContractController.show/2
        (block_scout_web 0.0.1) lib/block_scout_web/controllers/smart_contract_controller.ex:1: BlockScoutWeb.SmartContractController.action/2
        (block_scout_web 0.0.1) lib/block_scout_web/controllers/smart_contract_controller.ex:1: BlockScoutWeb.SmartContractController.phoenix_controller_pipeline/2
        (phoenix 1.5.4) lib/phoenix/router.ex:352: Phoenix.Router.__call__/2
        (phoenix 1.5.4) lib/phoenix/router/route.ex:41: Phoenix.Router.Route.call/2
        (phoenix 1.5.4) lib/phoenix/router.ex:352: Phoenix.Router.__call__/2
        (block_scout_web 0.0.1) lib/block_scout_web/endpoint.ex:1: BlockScoutWeb.Endpoint.plug_builder_call/2
        (block_scout_web 0.0.1) lib/plug/debugger.ex:132: BlockScoutWeb.Endpoint."call (overridable 3)"/2
        (block_scout_web 0.0.1) lib/block_scout_web/endpoint.ex:1: BlockScoutWeb.Endpoint."call (overridable 4)"/2
        (block_scout_web 0.0.1) lib/spandex_phoenix.ex:156: BlockScoutWeb.Endpoint.call/2
        (phoenix 1.5.4) lib/phoenix/endpoint/cowboy2_handler.ex:65: Phoenix.Endpoint.Cowboy2Handler.init/4
        (cowboy 2.8.0) /Users/viktor/Documents/POANetwork/blockscout/deps/cowboy/src/cowboy_handler.erl:37: :cowboy_handler.execute/2
        (cowboy 2.8.0) /Users/viktor/Documents/POANetwork/blockscout/deps/cowboy/src/cowboy_stream_h.erl:300: :cowboy_stream_h.execute/3
        (cowboy 2.8.0) /Users/viktor/Documents/POANetwork/blockscout/deps/cowboy/src/cowboy_stream_h.erl:291: :cowboy_stream_h.request_process/3
        (stdlib 3.12.1) proc_lib.erl:249: :proc_lib.init_p_do_apply/3

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[coveralls]

Pull Request Test Coverage Report for Build 7a72b121c5f502d3049383789de9bda744324ac2-PR-3477

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-1.3%) to 67.22%

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Files with Coverage Reduction	New Missed Lines	%
lib/block_scout_web/controllers/chain/market_history_chart_controller.ex	1	78.57%
test/block_scout_web/features/pages/chain_page.ex	1	90.0%

Totals
Change from base Build 3c80a04821f31140121742a42a43f7c846767b7d:	-1.3%
Covered Lines:	2067
Relevant Lines:	3075

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💛 - Coveralls