Allow navigation on history records without an at_value #61

Job	Run time
tests (3.0.6, gemfiles/Gemfile.6.1.mysql)	1m 5s
tests (3.0.6, gemfiles/Gemfile.6.1.pg)	1m 4s
tests (3.0.6, gemfiles/Gemfile.7.0.mysql)	1m 3s
tests (3.0.6, gemfiles/Gemfile.7.0.pg)	1m 8s
tests (3.0.6, gemfiles/Gemfile.7.1.mysql)	1m 13s
tests (3.0.6, gemfiles/Gemfile.7.1.pg)	1m 12s
tests (3.1.4, gemfiles/Gemfile.6.1.mysql)	1m 5s
tests (3.1.4, gemfiles/Gemfile.6.1.pg)	1m 2s
tests (3.1.4, gemfiles/Gemfile.7.0.mysql)	1m 2s
tests (3.1.4, gemfiles/Gemfile.7.0.pg)	1m 2s
tests (3.1.4, gemfiles/Gemfile.7.1.mysql)	1m 8s
tests (3.1.4, gemfiles/Gemfile.7.1.pg)	1m 10s
tests (3.2.2, gemfiles/Gemfile.6.1.mysql)	1m 4s
tests (3.2.2, gemfiles/Gemfile.6.1.pg)	1m 2s
tests (3.2.2, gemfiles/Gemfile.7.0.mysql)	1m 4s
tests (3.2.2, gemfiles/Gemfile.7.0.pg)	1m 2s
tests (3.2.2, gemfiles/Gemfile.7.1.mysql)	1m 12s
tests (3.2.2, gemfiles/Gemfile.7.1.pg)	1m 13s
publish	0s
	19m 51s

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