Fixed at:ifPresent:ifAbsentPut: calls.

[richardebeling]

fixes #88

[coveralls]

Pull Request Test Coverage Report for Build 249

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+7.8%) to 70.308%

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Totals
Change from base Build 244:	7.8%
Covered Lines:	663
Relevant Lines:	943

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💛 - Coveralls