Two problems with RequireIfMissing

I find it a bit confusing that the RequireIf*Missing* docstring is 
talking about RequireIf*Present*. Is the latter intended as an alias or 
is it deprecated? The docstring should make this more clear.

Also, it seems the _to_python() method of RequireIfMissing is wrongly 
referring to "value" instead of "value_dict" in the raise statement.

-- Christoph

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