Fixed KeyError when base-url is not set.
Fixed KeyError when base-url is not set.

nkatre/php-buildpack,skysports-digitalmedia/php-buildpack,jsloyer/php-buildpack,liuziyan/cf-php-build-pack,jsloyer/php-buildpack,ashish17das/cf-php-build,hairmare/php-buildpack,hpcloud/php-buildpack,nsharma283/PCF-php-buildpack,hjooyang/php-buildpack-3.2.2-,tgemal00/php-buildpack,ochamber/cf-php-build-pack,apawar2/php-buildpack,imaiworks/cf-php-build-pack-cakephp,jsloyer/php-buildpack,zhangyanfa/yanfaz-php-buildpack,svrc-pivotal/php-buildpack,isys01/cf-php-build-pack-cakephp,chregu/cf-php-varnish-buildpack,tgemal00/php-buildpack,nsharma283/PCF-php-buildpack,skysports-digitalmedia/php-buildpack,cf-identity/php-buildpack,nkatre/php-buildpack,skeeso/php-buildpack,zhangyanfa/yanfaz-php-buildpack,svrc-pivotal/php-buildpack,cloudfoundry/php-buildpack,hjooyang/php-buildpack,skeeso/php-buildpack,nsharma283/php-new,ochamber/cf-php-build-pack,liuziyan/cf-php-build-pack,cloudfoundry/php-buildpack,hairmare/php-buildpack,jan-randis/php-db2-mysql-buildpack,hpcloud/php-buildpack,hjooyang/php-buildpack,kumauta/cf-php-build-pack,aronreid/cf-php-buildpack,svrc-pivotal/php-buildpack,kei-yamazaki/cf-php-build-pack,tgemal00/php-buildpack,svennam92/php-buildpack,ToyamaTetsuji/test,cloudn/cf-php-build-pack,cf-identity/php-buildpack,ashish17das/cf-php-build,ArthurHlt/php-buildpack,imovedev/cf-php-build-pack-cakephp2,ArthurHlt/php-buildpack,jsloyer/php-buildpack,zizhongwei/php-buildpack-master,imovedev/cf-php-build-pack-def,imovedev/cf-php-build-pack-cakephp,ochamber/cf-php-build-pack,kumauta/cf-php-build-pack,ToyamaTetsuji/test,lloydbadger/test,lloydbadger/test,nsharma283/php-new,jan-randis/php-db2-mysql-buildpack,lloydbadger/test,skeeso/php-buildpack,jan-randis/php-db2-mysql-buildpack,zhangyanfa/yanfaz-php-buildpack,LeonidLe/php-buildpack,hpcloud/php-buildpack,mc500/php-buildpack,cf-identity/php-buildpack,cloudn/cf-php-build-pack,hairmare/php-buildpack,imovedev/cf-php-build-pack-cakephp2,lloydbadger/test,nsharma283/php-buildpack,nsharma283/php-buildpack,imovedev/cf-php-build-pack-def,cloudn/cf-php-build-pack,zizhongwei/php-buildpack-master,jsloyer/php-buildpack,zizhongwei/php-buildpack-master,isys01/cf-php-build-pack-cakephp,apawar2/php-buildpack,apawar2/php-buildpack,imovedev/cf-php-build-pack-cakephp,nsharma283/php-new,skysports-digitalmedia/php-buildpack,thesrinivas/php-buildpack,ochamber/cf-php-build-pack,nsharma283/PCF-php-buildpack,svrc-pivotal/php-buildpack,skeeso/php-buildpack,isys01/cf-php-build-pack-cakephp,hjooyang/php-buildpack-3.2.2-,hairmare/php-buildpack,kei-yamazaki/cf-php-build-pack,cloudfoundry/php-buildpack,cf-identity/php-buildpack,apawar2/php-buildpack,nsharma283/PCF-php-buildpack,ochamber/cf-php-build-pack,hairmare/php-buildpack,svennam92/php-buildpack,tgemal00/php-buildpack,LeonidLe/php-buildpack,thesrinivas/php-buildpack,nkatre/php-buildpack,nsharma283/php-buildpack,cloudfoundry/php-buildpack,tgemal00/php-buildpack,arjankroontolsma/post2,hpcloud/php-buildpack,hjooyang/php-buildpack,UNINETT/php-buildpack,aronreid/cf-php-buildpack,UNINETT/php-buildpack,cloudfoundry/php-buildpack,cf-identity/php-buildpack,mc500/php-buildpack,jan-randis/php-db2-mysql-buildpack,lloydbadger/test,imovedev/cf-php-build-pack-cakephp2,kumauta/cf-php-build-pack,hairmare/php-buildpack,thesrinivas/php-buildpack,ashish17das/cf-php-build,cf-identity/php-buildpack,lloydbadger/test,UNINETT/php-buildpack,hjooyang/php-buildpack-3.2.2-,arjankroontolsma/post2,chregu/cf-php-varnish-buildpack,mc500/php-buildpack,nsharma283/php-buildpack,UNINETT/php-buildpack,nsharma283/php-new,ArthurHlt/php-buildpack,zizhongwei/php-buildpack-master,ashish17das/cf-php-build,mc500/php-buildpack,nsharma283/php-buildpack,kei-yamazaki/cf-php-build-pack,aronreid/cf-php-buildpack,chregu/cf-php-varnish-buildpack,chregu/cf-php-varnish-buildpack,svrc-pivotal/php-buildpack,nsharma283/php-new,UNINETT/php-buildpack,kei-yamazaki/cf-php-build-pack,thesrinivas/php-buildpack,ArthurHlt/php-buildpack,apawar2/php-buildpack,hjooyang/php-buildpack,skeeso/php-buildpack,arjankroontolsma/post2,cloudfoundry/php-buildpack,mc500/php-buildpack,cloudfoundry/php-buildpack,zhangyanfa/yanfaz-php-buildpack,jsloyer/php-buildpack,nkatre/php-buildpack,ArthurHlt/php-buildpack,zizhongwei/php-buildpack-master,ochamber/cf-php-build-pack,ArthurHlt/php-buildpack,zhangyanfa/yanfaz-php-buildpack,kumauta/cf-php-build-pack,hjooyang/php-buildpack,cloudn/cf-php-build-pack,kumauta/cf-php-build-pack,tgemal00/php-buildpack,chregu/cf-php-varnish-buildpack,Orange-OpenSource/cf-php-build-pack,LeonidLe/php-buildpack,imovedev/cf-php-build-pack-cakephp,thesrinivas/php-buildpack,nsharma283/php-buildpack,hairmare/php-buildpack,hjooyang/php-buildpack-3.2.2-,arjankroontolsma/post2,nsharma283/PCF-php-buildpack,cloudn/cf-php-build-pack,skysports-digitalmedia/php-buildpack,jan-randis/php-db2-mysql-buildpack,LeonidLe/php-buildpack,chregu/cf-php-varnish-buildpack,UNINETT/php-buildpack,imaiworks/cf-php-build-pack-cakephp,ashish17das/cf-php-build,ToyamaTetsuji/test,hpcloud/php-buildpack,LeonidLe/php-buildpack,cloudn/cf-php-build-pack,hpcloud/php-buildpack,svrc-pivotal/php-buildpack,aronreid/cf-php-buildpack,hjooyang/php-buildpack-3.2.2-,thesrinivas/php-buildpack,arjankroontolsma/post2,jan-randis/php-db2-mysql-buildpack,kei-yamazaki/cf-php-build-pack,ashish17das/cf-php-build,liuziyan/cf-php-build-pack,aronreid/cf-php-buildpack,zizhongwei/php-buildpack-master,Orange-OpenSource/cf-php-build-pack,imaiworks/cf-php-build-pack-cakephp,skeeso/php-buildpack,Orange-OpenSource/cf-php-build-pack,aronreid/cf-php-buildpack,skysports-digitalmedia/php-buildpack,svennam92/php-buildpack,nkatre/php-buildpack,arjankroontolsma/post2,nsharma283/php-new,svennam92/php-buildpack,svennam92/php-buildpack,nkatre/php-buildpack,apawar2/php-buildpack,nsharma283/PCF-php-buildpack,skysports-digitalmedia/php-buildpack,hjooyang/php-buildpack-3.2.2-,kumauta/cf-php-build-pack,kei-yamazaki/cf-php-build-pack,cf-identity/php-buildpack,mc500/php-buildpack,LeonidLe/php-buildpack,hjooyang/php-buildpack,imovedev/cf-php-build-pack-def,zhangyanfa/yanfaz-php-buildpack,svennam92/php-buildpack