gpgparsemail: Fix case of zero length continuation lines.
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gpgparsemail: Fix case of zero length continuation lines.

* tools/rfc822parse.c (parse_field): Loop after continuation line.

Using header lines like

Name:[lf]
[space][lf]
[lf]

resulted in running into the "(s2 = strchr (delimiters2, *s)" branch
and inserting a new token for the empty continuation line. This also
led to one byte read after the string which is what Hanno figured.
The new code should handle empty continuation lines correct.

(backported from 2.1 commit 3fbeba64a8bfb2b673230c124a3d616b6568fd2f)