Fix XML::Node#errors to return nil when empty
#12795
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This restores the original semantics prior to the refactoring of crystal-lang#12663
straight-shoota
added
kind:bug
topic:stdlib:serialization
kind:regression
beta-ziliani
approved these changes
Nov 28, 2022
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This restores the original semantics prior to the refactoring of #12663
Ref: #12663 (comment)