Insignificant space in matching rules

[Hallvard B Furuseth <h.b.furuseth@usit.uio.no>]

[Syntaxes] says:

> 5.2 Matching Rule Definitions
>   When evaluating the caseExactIA5Match, caseIgnoreIA5Match, (...)
>   leading and trailing whitespace is ignored

    except that a string consisting of only whitespace is treated
    as a single space.

If leading whitespace were ignored in a space-only string, it would
be treated as the invalid string "", so the filter would evaluate to
undefined.

-- 
Hallvard