Don't subscribe deep to a to-one instance if it doesn't exist.
Don't subscribe deep to a to-one instance if it doesn't exist.

closes #1592

yinhe007/sails,haavardw/sails,marnusw/sails,antodoms/sails,prssn/sails,saronwei/sails,krishnaglick/sails,cazulu/sails,artBrown/sails,jakutis/sails,wsaccaco/sails,mnaughto/sails,shaunstanislaus/sails,taogb/sails,balderdashy/sails,zand3rs/sails,harrissoerja/sails,corbanb/sails,ctartist621/sails,listepo/sails,EdisonSu768/sails,pmq20/sails,togusafish/logikinc-_-sails,Benew/sails,erkstruwe/sails,vip-git/sails,mphasize/sails,dylannnn/sails,dbuentello/sails,vip-git/sails,rlugojr/sails,jenalgit/sails,alex-zhang/sails,calling/sails,janladaking/sails,leobudima/sails,konstantinzolotarev/sails,hokkoo/sails,mauricionr/sails,justsml/sails,t2013anurag/sails,saniko/soundcloud_mithril,Karnith/sails-for-gulp,alexferreira/sails,xjpro/sails-windows-associations,Hanifb/sails,rlugojr/sails,jsisaev1/sails,boarderdav/sails,Shyp/sails,tjwebb/sails,adrianha/sails,metidia/sails,youprofit/sails,jianpingw/sails,jianpingw/sails,winlolo/sails,Josebaseba/sails,sunnycmf/sails,baracudaengine/SailsUi,hokkoo/sails,AnyPresence/sails,JumpLink/sails,antoniopol06/sails,tempbottle/sails,anweiss/sails,curphey/sails,yangchuoxian/sails,scippio/sails,kevinburke/sails,apowers313/sails,hellowin/sails,saniko/soundcloud_mithril