api/app: fix unset message to not print extra \n characters
api/app: fix unset message to not print extra \n characters

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