Change OnlyContain to succeed on empty collections

[IT-VBFK]

This ref: #2321 (comment)

And: #1492

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[github-actions]

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It seems all right 👌

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[coveralls]

Pull Request Test Coverage Report for Build 6351514025

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.001%) to 97.273%

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Totals
Change from base Build 6348536689:	-0.001%
Covered Lines:	11617
Relevant Lines:	11823

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💛 - Coveralls