api/app: simplify app.destroy
api/app: simplify app.destroy

There is no need for this checking. It's up to the caller to provide the
app with all fields populated ;)

Actually, AppDelete handler already does that, so that was a duplicated
work.

tsuru/tsuru,mderaldo/tsuru,cezarsa/tsuru,tsuru/tsuru,cgvarela/tsuru,firebitsbr/tsuru,guilhermebr/tsuru,hcxiong/tsuru,Endika/tsuru,RichardKnop/tsuru,4eek/tsuru,tsuru/tsuru,ggarnier/tsuru,mderaldo/tsuru,gciotta/tsuru,hcxiong/tsuru,jblancett/tsuru,hcxiong/tsuru,RichardKnop/tsuru,guilhermebr/tsuru,gwmoura/tsuru,jblancett/tsuru,cezarsa/tsuru,kgrvamsi/tsuru,Endika/tsuru,tsuru/tsuru,cgvarela/tsuru,cezarsa/tsuru,cezarsa/tsuru,mderaldo/tsuru,ggarnier/tsuru,firebitsbr/tsuru,ArxdSilva/tsuru,firebitsbr/tsuru,kgrvamsi/tsuru,4eek/tsuru,ggarnier/tsuru,tuxmonteiro/tsuru,hugoantunes/tsuru,hugoantunes/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,kgrvamsi/tsuru,tuxmonteiro/tsuru,guilhermebr/tsuru,gwmoura/tsuru,4eek/tsuru,guilhermebr/tsuru,gwmoura/tsuru,gciotta/tsuru,cgvarela/tsuru,tuxmonteiro/tsuru,ArxdSilva/tsuru,gciotta/tsuru,Endika/tsuru,RichardKnop/tsuru,jblancett/tsuru,ArxdSilva/tsuru