Pass empty hash correctly to iterator #3645

Job	Run time
Build-And-Test-Web	6m 0s
Build-And-Test-Server (Simple integration tests)	18m 16s
Build-And-Test-Server (DEX integration tests)	13m 56s
Build-And-Test-Server (DEX integration test with proofs)	13m 19s
Build-And-Test-Server (Voting integration tests)	5m 52s
Build-And-Test-Server (Unit tests)	39m 47s
Build-And-Test-Server (Verification Key Regression Check)	11m 16s
Build-And-Test-Server (CommonJS test)	2m 46s
Release-on-NPM	2m 6s
Release-mina-signer-on-NPM	2m 6s
	1h 55m 24s

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