Don't set defaults that will always be overwritten

The constructors previously defaulted all properties. This is dead code
for properties that are always set on items from outside during parsing,
and obfuscates the code flow and wastes time. Instead, just mention
other properties that exist in comments in the constructors.

Also add test cases for missing and empty 'choice' help texts. Removing
the default 'self._help = None' assignment in Choice.__init__() wasn't
caught by the selftests.

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