More fixes and tests

[coveralls]

Pull Request Test Coverage Report for Build 4983813975

• 46 of 51 (90.2%) changed or added relevant lines in 3 files are covered.
• 3 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+31.9%) to 90.28%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
linkcheck_gui/init.py	18	23	78.26%
<!--	Total:	46	51	90.2%	-->

Files with Coverage Reduction	New Missed Lines	%
linkcheck_gui/init.py	3	78.83%
<!--	Total:	3		-->

Totals
Change from base Build 4875318094:	31.9%
Covered Lines:	1904
Relevant Lines:	2109

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💛 - Coveralls