fcrdns: check validity of orgDomain before using

fix for crashing Issue #664
uribl: fix for CRIT (see below)

Aug 31 11:23:17 filter1-mail haraka[73661]: [CRIT]
[7B9E9C9A-D4B7-492E-B32D-3D0C116CF333.1] [core] Plugin data.uribl failed:
TypeError: Cannot read property 'bodytext' of null     at extract_urls
(/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:350:40)     at
do_body (/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:327:9)
at chain_caller
(/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:340:9)     at
do_msgid_header
(/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:321:9)     at
chain_caller (/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:340:9)
at do_replyto_header
(/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:311:9)     at
chain_caller (/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:340:9)
at do_from_header
(/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:301:9)     at
chain_caller (/usr/local/lib/node_modules/Haraka/plugins/data.uribl.js:340:9)
at Plugin.exports.hook_data_post
(/usr/local/lib/node_modules/Haraka/plugins/data.
spamassassin: check transaction before accessing

so that this error doesn't happen:

Aug 31 16:01:09 filter1-mail haraka[73661]: [CRIT] [-] [core] TypeError:
Cannot read property 'message_stream' of null
Aug 31 16:01:09 filter1-mail node[73661]: [CRIT] [-] [core]     at
Socket.<anonymous>
(/usr/local/lib/node_modules/Haraka/plugins/spamassassin.js:32:31)
Aug 31 16:01:09 filter1-mail node[73661]: [CRIT] [-] [core]     at Socket.emit
(events.js:117:20)
Aug 31 16:01:09 filter1-mail node[73661]: [CRIT] [-] [core]     at
Object.afterConnect [as oncomplete] (net.js:886:10)
Merge pull request #665 from msimerson/fcrdns

fix CRIT errors in fcrdns, uribl, and spamassassin