patch to reveal bug and strange behaviours when GPGME_EXPORT_MODE_EXTERN is set

[jbar]

First as attachement u have my gpgme/tests/run-export.c and its diff from git://git.gnupg.org/gpgme.git

You will see that Now "./run-export --extern USERID" doesn't send anymore key (But gpgme_op_export doesn't return any error).

But, and that what is strange: "./run-export --extern KEY_IDS or FPRS " really send keys.

- Why ??

If you compile with an added flag GET_KEY_FROM_ID it also works as expected.
(But I didn't expect that since that's the procedure I use in my own program... where my "gpgme_op_export_keys(...GPGME_EXPORT_MODE_EXTERN...)" call fail without returning an error :'-( ).

Also please give me some tips to understand why the procedure in my programm may behave like this !?

Thanks,
-- 
jbar <jeanjacquesbrucker at gmail.com>
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