Fix: Text pack for layout without pack

[penguinolog]

• fix minor type checks

Checklist

• I've ensured that similar functionality has not already been implemented
• I've ensured that similar functionality has not earlier been proposed and declined
• I've branched off the master or python-dual-support branch
• I've merged fresh upstream into my branch recently
• I've ran tox successfully in local environment
• I've included docstrings and/or documentation and/or examples for my code (if this is a new feature)

[penguinolog]

bug

[coveralls]

Pull Request Test Coverage Report for Build 7972941444

Details

• -6 of 21 (71.43%) changed or added relevant lines in 8 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.005%) to 71.285%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
urwid/widget/scrollable.py	0	1	0.0%
urwid/widget/frame.py	7	9	77.78%
urwid/display/_raw_display_base.py	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
urwid/listbox.py	1	83.78%

Totals
Change from base Build 7960646132:	-0.005%
Covered Lines:	8931
Relevant Lines:	12634

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💛 - Coveralls