Only bake HABTM associations for tables that exist.
Only bake HABTM associations for tables that exist.

bake often guesses wrong when it comes to habtm. Only add associations
we're highly confident of. This includes tables where the foreign table
also exists.

Refs #3532

erikfig/cakephp,michaelze/cakephp,HavokInspiration/cakephp,Balachan27/cakephp,eboominathan/cakephp,dakota/cakephp,HavokInspiration/cakephp,akintoey/cakephp,burriko/cakephp,mvdriel/cakephp,ndm2/cakephp,timhoeppner/cakephp,CVO-Technologies/cakephp,mvdriel/cakephp,thinkingmedia/cakephp,jjj117/cakephp,akintoey/cakephp,tenkoma/cakephp,yinhe007/cakephp,jerems02/cakephp,eryw/cakephp,jeffblack360/cakephp,ADmad/cakephp,gmponos/cakephp,ndm2/cakephp,CakeDC/cakephp,petteyg/cakephp,pbaire/cakephp,akintoey/cakephp,justinyost/cakephp,timhoeppner/cakephp,cakephp-fr/cakephp,tisu2tisu/cakephp,garethellis36/cakephp,tenkoma/cakephp,michaelze/cakephp,nrother/cakephp,davidyell/cakephp,dkarvounaris/cakephp,CVO-Technologies/cakephp,Phillaf/cakephp,adopico/cakephp,yinhe007/cakephp,eboominathan/cakephp,jeffblack360/cakephp,pbaire/cakephp,timhoeppner/cakephp,ionas/cakephp,dkarvounaris/cakephp,berrygoudswaard/cakephp,tisu2tisu/cakephp,et304383/passbolt_api,jjj117/cakephp,pbaire/cakephp,elboletaire/cakephp,burriko/cakephp,web-player/cakephp,kumamidori/cakephp,web-player/cakephp,et304383/passbolt_api,ionas/cakephp,kumamidori/cakephp,khoimt/cakephp-study,ionas/cakephp,ADmad/cakephp,ADmad/cakephp,nrother/cakephp,CakeDC/cakephp,petteyg/cakephp,bravo-kernel/cakephp,jeffblack360/cakephp,elboletaire/cakephp,CakeDC/cakephp,ndm2/cakephp,Phillaf/cakephp,dakota/cakephp,eryw/cakephp,justinyost/cakephp,jerems02/cakephp,gmponos/cakephp,davidyell/cakephp,dakota/cakephp,nrother/cakephp,bravo-kernel/cakephp,cakephp-fr/cakephp,eboominathan/cakephp,garethellis36/cakephp,web-player/cakephp,thinkingmedia/cakephp,elboletaire/cakephp,burriko/cakephp,Balachan27/cakephp,ndm2/cakephp,thinkingmedia/cakephp,khoimt/cakephp-study,justinyost/cakephp,petteyg/cakephp,dkarvounaris/cakephp,CVO-Technologies/cakephp,tgr0ss/cakephp,tisu2tisu/cakephp,kumamidori/cakephp,dakota/cakephp,jerems02/cakephp,davidyell/cakephp,HavokInspiration/cakephp,cakephp-fr/cakephp,garethellis36/cakephp,yinhe007/cakephp,tgr0ss/cakephp,khoimt/cakephp-study,Balachan27/cakephp,Phillaf/cakephp,cakephp/cakephp,cakephp/cakephp,ADmad/cakephp,adopico/cakephp,erikfig/cakephp,tgr0ss/cakephp,berrygoudswaard/cakephp,erikfig/cakephp,gmponos/cakephp,et304383/passbolt_api,berrygoudswaard/cakephp,jjj117/cakephp,bravo-kernel/cakephp,cakephp/cakephp,mvdriel/cakephp,garethellis36/cakephp,eryw/cakephp,michaelze/cakephp,cakephp/cakephp,tenkoma/cakephp,et304383/passbolt_api,tenkoma/cakephp,adopico/cakephp,et304383/passbolt_api,CakeDC/cakephp,petteyg/cakephp,mvdriel/cakephp