Adding isset() checks for CakeSchema::compare() when diff'ing db indexes.
Adding isset() checks for CakeSchema::compare() when diff'ing db indexes.

Allows for slightly better interoperability between schemas generated with CakePHP 1.2 and with 1.3

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