fix: permit empty `inputs`

[sweetleon]

Goals

Allow empty inputs (i.e., {}).

Implementation

Treat empty inputs as null/falsey.

For discussion

Unless we want to punish fools who try to send empty inputs...

[coveralls]

Pull Request Test Coverage Report for Build 736

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 36:	0.0%
Covered Lines:	62
Relevant Lines:	62

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💛 - Coveralls