Bugfix: guard run_update_check

[gabyx]

Small CLI fix: Function run_update_check -> read_single_repo_info might be executed while not in a repository, outputting an error.

Thx for merging.

[coveralls]

Pull Request Test Coverage Report for Build 575

• 2 of 3 (66.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.03%) to 84.189%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
cli.sh	2	3	66.67%
<!--	Total:	2	3	66.67%	-->

Totals
Change from base Build 574:	-0.03%
Covered Lines:	2018
Relevant Lines:	2397

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💛 - Coveralls

[rycus86]

Thanks!