[6.1.0]Allow map_each
to return None
in TemplateDict#add_joined
#17288
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Mimics the behavior of
Args#add_all
'smap_each
callback and can be used to skip over values.Also improves the error message when the callback returns an unexpected type by including the value.
Closes #16924.
PiperOrigin-RevId: 493609265
Change-Id: Ia9e42dd7edc2928a9945ce647d638fcb94037bc8