[PATCH] crypto: return NULL cryptoctx if protocol string is empty.

[Jameson Graef Rollins]

On Fri, Jul 19 2013, Jameson Graef Rollins <jrollins at finestructure.net> wrote:
> Badly formed messages that don't specify a protocol in
> signed/encrypted parts, end up with a protocol of NULL.  strcasecmp in
> notmuch_crypto_get_context then segfaults when trying to check it
> against known protocols.  If the protocol is NULL, just return an
> empty context immediately (with appropriate message.)

Fixes bug reported in id:87mwpiu4vi.fsf at zancas.localnet

jamie.
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