Fix in-memory commit getters trying to parse
Fix in-memory commit getters trying to parse

Issue 9 on the tracker. The commit object getters for in-memory objects
were trying to parse an inexistant on-disk object when one of the commit
attributes which were still not set was queried.

We now return a NULL value when this happens.

Signed-off-by: Vicent Marti <6838a7c51796da15c3e6eae80ee6aba806e8818a@gmail.com>

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