Fix a lot of NULL errors in WireLib.CanTool and WireLib.CheckFont - #3724

Process completed with exit code 1.

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Inconsistent use of 'not' and '!'

Unused variable: k

Unused variable: k

Unused variable: k

Unused variable: k

Unused variable: k

Inconsistent use of '!' and 'not'

Inconsistent use of '!' and 'not'

Inconsistent use of 'not' and '!'

Inconsistent use of 'not' and '!'

gh-actions-lua: Cache restored: lua:luajit-2.1:linux:x64: