Followup for character properties in revno 105542.

Followup for character properties in revno 105542.

 src/bidi.c (bidi_get_type): Abort if we get zero as the bidi type of
 a character.
 admin/unidata/unidata-gen.el (unidata-prop-alist): Update the default
 values of bidi-class according to DerivedBidiClass.txt from the
 latest UCD.
 lisp/international/uni-bidi.el: Regenerated.
 doc/lispref/nonascii.texi (Character Properties): Document the values for
 unassigned codepoints.