[-] fix cannot scan NULL into *string, closes #725

[pashagolub]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 19066894532

Details

• 9 of 9 (100.0%) changed or added relevant lines in 1 file are covered.
• 6 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+3.1%) to 87.519%

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Files with Coverage Reduction	New Missed Lines	%
internal/scheduler/interval_chain.go	2	86.96%
internal/scheduler/chain.go	4	85.53%

Totals
Change from base Build 18843114373:	3.1%
Covered Lines:	1732
Relevant Lines:	1979

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💛 - Coveralls