do not fail if failure reason is atom

[ayrat555]

fixes #1682

sometimes requests return atoms as a reason for request failure. For example, {:error, :closed} or {:error, :request_timeout}. these atome were raised raise :closed which is caused the error.

Changelog

• do not fail if failure reason is atom

[coveralls]

Pull Request Test Coverage Report for Build b6d6f10b-cd26-4310-9f9c-68f5508189a8

• 0 of 1 (0.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.003%) to 83.025%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
apps/ethereum_jsonrpc/lib/ethereum_jsonrpc/contract.ex	0	1	0.0%

Totals
Change from base Build 0eea6466-7f76-42cf-b622-4045b3eeb709:	0.003%
Covered Lines:	4446
Relevant Lines:	5355

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💛 - Coveralls