Handle unbounded joints in custom configuration vectors

[coveralls]

Pull Request Test Coverage Report for Build 7644679594

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 99.825%

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Totals
Change from base Build 7642924194:	0.002%
Covered Lines:	1142
Relevant Lines:	1144

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💛 - Coveralls