Bail out if remote->url would be NULL
Bail out if remote->url would be NULL

This fixes a crash from attempting to invoke git__strdup() against NULL.

jflesch/libgit2-mariadb,since2014/libgit2,ardumont/libgit2,mingyaaaa/libgit2,Tousiph/Demo1,JIghtuse/libgit2,iankronquist/libgit2,swisspol/DEMO-libgit2,mrksrm/Mingijura,kenprice/libgit2,kissthink/libgit2,iankronquist/libgit2,jeffhostetler/public_libgit2,amyvmiwei/libgit2,kenprice/libgit2,dleehr/libgit2,linquize/libgit2,rcorre/libgit2,linquize/libgit2,JIghtuse/libgit2,nacho/libgit2,falqas/libgit2,jeffhostetler/public_libgit2,Tousiph/Demo1,spraints/libgit2,t0xicCode/libgit2,whoisj/libgit2,Tousiph/Demo1,mingyaaaa/libgit2,mingyaaaa/libgit2,oaastest/libgit2,magnus98/TEST,sim0629/libgit2,ardumont/libgit2,maxiaoqian/libgit2,rcorre/libgit2,evhan/libgit2,since2014/libgit2,spraints/libgit2,zodiac/libgit2.js,dleehr/libgit2,evhan/libgit2,magnus98/TEST,JIghtuse/libgit2,linquize/libgit2,yosefhackmon/libgit2,kenprice/libgit2,nokiddin/libgit2,yosefhackmon/libgit2,Tousiph/Demo1,spraints/libgit2,yosefhackmon/libgit2,raybrad/libit2,mcanthony/libgit2,sygool/libgit2,mcanthony/libgit2,mhp/libgit2,since2014/libgit2,magnus98/TEST,zodiac/libgit2.js,mrksrm/Mingijura,jamieleecool/ptest,joshtriplett/libgit2,kissthink/libgit2,saurabhsuniljain/libgit2,mhp/libgit2,amyvmiwei/libgit2,t0xicCode/libgit2,sim0629/libgit2,yongthecoder/libgit2,rcorre/libgit2,kissthink/libgit2,amyvmiwei/libgit2,yongthecoder/libgit2,nokiddin/libgit2,JIghtuse/libgit2,sim0629/libgit2,whoisj/libgit2,mhp/libgit2,saurabhsuniljain/libgit2,mingyaaaa/libgit2,spraints/libgit2,yongthecoder/libgit2,sygool/libgit2,JIghtuse/libgit2,stewid/libgit2,KTXSoftware/libgit2,joshtriplett/libgit2,mingyaaaa/libgit2,claudelee/libgit2,jamieleecool/ptest,yosefhackmon/libgit2,jflesch/libgit2-mariadb,kissthink/libgit2,chiayolin/libgit2,sygool/libgit2,mcanthony/libgit2,t0xicCode/libgit2,iankronquist/libgit2,MrHacky/libgit2,rcorre/libgit2,jamieleecool/ptest,nokiddin/libgit2,raybrad/libit2,sygool/libgit2,amyvmiwei/libgit2,joshtriplett/libgit2,saurabhsuniljain/libgit2,Snazz2001/libgit2,leoyanggit/libgit2,zodiac/libgit2.js,falqas/libgit2,spraints/libgit2,nokiddin/libgit2,kenprice/libgit2,sim0629/libgit2,joshtriplett/libgit2,kissthink/libgit2,maxiaoqian/libgit2,Corillian/libgit2,yongthecoder/libgit2,kenprice/libgit2,nacho/libgit2,iankronquist/libgit2,yosefhackmon/libgit2,MrHacky/libgit2,swisspol/DEMO-libgit2,raybrad/libit2,oaastest/libgit2,sim0629/libgit2,claudelee/libgit2,ardumont/libgit2,whoisj/libgit2,skabel/manguse,since2014/libgit2,maxiaoqian/libgit2,zodiac/libgit2.js,joshtriplett/libgit2,KTXSoftware/libgit2,sim0629/libgit2,stewid/libgit2,whoisj/libgit2,spraints/libgit2,skabel/manguse,amyvmiwei/libgit2,t0xicCode/libgit2,oaastest/libgit2,leoyanggit/libgit2,mingyaaaa/libgit2,saurabhsuniljain/libgit2,evhan/libgit2,Snazz2001/libgit2,magnus98/TEST,falqas/libgit2,Corillian/libgit2,t0xicCode/libgit2,since2014/libgit2,claudelee/libgit2,stewid/libgit2,leoyanggit/libgit2,chiayolin/libgit2,Snazz2001/libgit2,t0xicCode/libgit2,rcorre/libgit2,chiayolin/libgit2,raybrad/libit2,magnus98/TEST,skabel/manguse,Corillian/libgit2,skabel/manguse,linquize/libgit2,oaastest/libgit2,oaastest/libgit2,MrHacky/libgit2,dleehr/libgit2,mcanthony/libgit2,jeffhostetler/public_libgit2,nokiddin/libgit2,dleehr/libgit2,mrksrm/Mingijura,swisspol/DEMO-libgit2,chiayolin/libgit2,MrHacky/libgit2,swisspol/DEMO-libgit2,oaastest/libgit2,mrksrm/Mingijura,mhp/libgit2,Aorjoa/libgit2_maked_lib,maxiaoqian/libgit2,jflesch/libgit2-mariadb,mrksrm/Mingijura,Corillian/libgit2,falqas/libgit2,raybrad/libit2,claudelee/libgit2,claudelee/libgit2,Corillian/libgit2,yongthecoder/libgit2,nacho/libgit2,mcanthony/libgit2,skabel/manguse,falqas/libgit2,Aorjoa/libgit2_maked_lib,Snazz2001/libgit2,mcanthony/libgit2,swisspol/DEMO-libgit2,jamieleecool/ptest,sygool/libgit2,whoisj/libgit2,maxiaoqian/libgit2,maxiaoqian/libgit2,mhp/libgit2,Snazz2001/libgit2,KTXSoftware/libgit2,iankronquist/libgit2,JIghtuse/libgit2,stewid/libgit2,swisspol/DEMO-libgit2,leoyanggit/libgit2,leoyanggit/libgit2,rcorre/libgit2,KTXSoftware/libgit2,Aorjoa/libgit2_maked_lib,amyvmiwei/libgit2,nokiddin/libgit2,kenprice/libgit2,ardumont/libgit2,ardumont/libgit2,evhan/libgit2,saurabhsuniljain/libgit2,dleehr/libgit2,magnus98/TEST,yongthecoder/libgit2,joshtriplett/libgit2,KTXSoftware/libgit2,jeffhostetler/public_libgit2,chiayolin/libgit2,mrksrm/Mingijura,nacho/libgit2,jflesch/libgit2-mariadb,Snazz2001/libgit2,jeffhostetler/public_libgit2,jflesch/libgit2-mariadb,whoisj/libgit2,Tousiph/Demo1,saurabhsuniljain/libgit2,skabel/manguse,mhp/libgit2,claudelee/libgit2,ardumont/libgit2,stewid/libgit2,chiayolin/libgit2,linquize/libgit2,dleehr/libgit2,jflesch/libgit2-mariadb,zodiac/libgit2.js,sygool/libgit2,kissthink/libgit2,MrHacky/libgit2,MrHacky/libgit2,jeffhostetler/public_libgit2,leoyanggit/libgit2,Aorjoa/libgit2_maked_lib,yosefhackmon/libgit2,KTXSoftware/libgit2,Corillian/libgit2,linquize/libgit2,iankronquist/libgit2,falqas/libgit2,since2014/libgit2,Aorjoa/libgit2_maked_lib,stewid/libgit2,Tousiph/Demo1