Fixed spawn_btree_backfill so that it only calls ->done once when there are no keys on a particular slice.
Fixed spawn_btree_backfill so that it only calls ->done once when there are no keys on a particular slice.

captainpete/rethinkdb,niieani/rethinkdb,jesseditson/rethinkdb,losywee/rethinkdb,ayumilong/rethinkdb,rrampage/rethinkdb,alash3al/rethinkdb,nviennot/rethinkdb,jesseditson/rethinkdb,AntouanK/rethinkdb,wkennington/rethinkdb,ayumilong/rethinkdb,rrampage/rethinkdb,jesseditson/rethinkdb,yaolinz/rethinkdb,wkennington/rethinkdb,niieani/rethinkdb,victorbriz/rethinkdb,JackieXie168/rethinkdb,gdi2290/rethinkdb,rrampage/rethinkdb,scripni/rethinkdb,wojons/rethinkdb,wojons/rethinkdb,alash3al/rethinkdb,jfriedly/rethinkdb,niieani/rethinkdb,bchavez/rethinkdb,Qinusty/rethinkdb,JackieXie168/rethinkdb,catroot/rethinkdb,Qinusty/rethinkdb,niieani/rethinkdb,wujf/rethinkdb,robertjpayne/rethinkdb,spblightadv/rethinkdb,nviennot/rethinkdb,4talesa/rethinkdb,KSanthanam/rethinkdb,victorbriz/rethinkdb,greyhwndz/rethinkdb,RubenKelevra/rethinkdb,sebadiaz/rethinkdb,jmptrader/rethinkdb,ajose01/rethinkdb,spblightadv/rethinkdb,wujf/rethinkdb,rrampage/rethinkdb,pap/rethinkdb,captainpete/rethinkdb,wojons/rethinkdb,eliangidoni/rethinkdb,gavioto/rethinkdb,wkennington/rethinkdb,4talesa/rethinkdb,KSanthanam/rethinkdb,jesseditson/rethinkdb,Wilbeibi/rethinkdb,KSanthanam/rethinkdb,eliangidoni/rethinkdb,scripni/rethinkdb,bpradipt/rethinkdb,greyhwndz/rethinkdb,sontek/rethinkdb,greyhwndz/rethinkdb,ajose01/rethinkdb,Qinusty/rethinkdb,sbusso/rethinkdb,niieani/rethinkdb,yakovenkodenis/rethinkdb,AtnNn/rethinkdb,marshall007/rethinkdb,lenstr/rethinkdb,sbusso/rethinkdb,victorbriz/rethinkdb,gavioto/rethinkdb,bchavez/rethinkdb,jfriedly/rethinkdb,eliangidoni/rethinkdb,eliangidoni/rethinkdb,ayumilong/rethinkdb,eliangidoni/rethinkdb,dparnell/rethinkdb,mbroadst/rethinkdb,sontek/rethinkdb,yaolinz/rethinkdb,AtnNn/rethinkdb,wojons/rethinkdb,sbusso/rethinkdb,tempbottle/rethinkdb,mbroadst/rethinkdb,sebadiaz/rethinkdb,yakovenkodenis/rethinkdb,bchavez/rethinkdb,sontek/rethinkdb,gavioto/rethinkdb,Qinusty/rethinkdb,greyhwndz/rethinkdb,scripni/rethinkdb,RubenKelevra/rethinkdb,pap/rethinkdb,JackieXie168/rethinkdb,losywee/rethinkdb,sbusso/rethinkdb,bpradipt/rethinkdb,4talesa/rethinkdb,ajose01/rethinkdb,Qinusty/rethinkdb,AntouanK/rethinkdb,urandu/rethinkdb,mcanthony/rethinkdb,robertjpayne/rethinkdb,victorbriz/rethinkdb,scripni/rethinkdb,JackieXie168/rethinkdb,losywee/rethinkdb,matthaywardwebdesign/rethinkdb,mquandalle/rethinkdb,mquandalle/rethinkdb,lenstr/rethinkdb,losywee/rethinkdb,Wilbeibi/rethinkdb,Qinusty/rethinkdb,mbroadst/rethinkdb,KSanthanam/rethinkdb,yakovenkodenis/rethinkdb,alash3al/rethinkdb,ajose01/rethinkdb,AntouanK/rethinkdb,bchavez/rethinkdb,mcanthony/rethinkdb,yakovenkodenis/rethinkdb,elkingtonmcb/rethinkdb,Qinusty/rethinkdb,victorbriz/rethinkdb,yaolinz/rethinkdb,JackieXie168/rethinkdb,gdi2290/rethinkdb,mbroadst/rethinkdb,wujf/rethinkdb,nviennot/rethinkdb,dparnell/rethinkdb,RubenKelevra/rethinkdb,ayumilong/rethinkdb,elkingtonmcb/rethinkdb,greyhwndz/rethinkdb,sebadiaz/rethinkdb,Qinusty/rethinkdb,spblightadv/rethinkdb,yaolinz/rethinkdb,KSanthanam/rethinkdb,marshall007/rethinkdb,pap/rethinkdb,matthaywardwebdesign/rethinkdb,grandquista/rethinkdb,sebadiaz/rethinkdb,matthaywardwebdesign/rethinkdb,captainpete/rethinkdb,robertjpayne/rethinkdb,bchavez/rethinkdb,rrampage/rethinkdb,bchavez/rethinkdb,gavioto/rethinkdb,wujf/rethinkdb,KSanthanam/rethinkdb,mbroadst/rethinkdb,Wilbeibi/rethinkdb,mbroadst/rethinkdb,robertjpayne/rethinkdb,mquandalle/rethinkdb,grandquista/rethinkdb,pap/rethinkdb,captainpete/rethinkdb,mcanthony/rethinkdb,JackieXie168/rethinkdb,jfriedly/rethinkdb,losywee/rethinkdb,pap/rethinkdb,spblightadv/rethinkdb,JackieXie168/rethinkdb,AntouanK/rethinkdb,sebadiaz/rethinkdb,Wilbeibi/rethinkdb,dparnell/rethinkdb,bpradipt/rethinkdb,pap/rethinkdb,urandu/rethinkdb,tempbottle/rethinkdb,tempbottle/rethinkdb,alash3al/rethinkdb,grandquista/rethinkdb,urandu/rethinkdb,nviennot/rethinkdb,ayumilong/rethinkdb,Wilbeibi/rethinkdb,tempbottle/rethinkdb,grandquista/rethinkdb,sebadiaz/rethinkdb,pap/rethinkdb,dparnell/rethinkdb,ayumilong/rethinkdb,jmptrader/rethinkdb,urandu/rethinkdb,tempbottle/rethinkdb,wujf/rethinkdb,jmptrader/rethinkdb,gavioto/rethinkdb,victorbriz/rethinkdb,bpradipt/rethinkdb,elkingtonmcb/rethinkdb,mbroadst/rethinkdb,losywee/rethinkdb,jmptrader/rethinkdb,greyhwndz/rethinkdb,jmptrader/rethinkdb,RubenKelevra/rethinkdb,robertjpayne/rethinkdb,yaolinz/rethinkdb,elkingtonmcb/rethinkdb,catroot/rethinkdb,robertjpayne/rethinkdb,sontek/rethinkdb,4talesa/rethinkdb,4talesa/rethinkdb,robertjpayne/rethinkdb,jesseditson/rethinkdb,niieani/rethinkdb,lenstr/rethinkdb,jfriedly/rethinkdb,catroot/rethinkdb,jesseditson/rethinkdb,marshall007/rethinkdb,elkingtonmcb/rethinkdb,mbroadst/rethinkdb,victorbriz/rethinkdb,robertjpayne/rethinkdb,lenstr/rethinkdb,jfriedly/rethinkdb,dparnell/rethinkdb,mcanthony/rethinkdb,bchavez/rethinkdb,gdi2290/rethinkdb,KSanthanam/rethinkdb,losywee/rethinkdb,sbusso/rethinkdb,greyhwndz/rethinkdb,grandquista/rethinkdb,matthaywardwebdesign/rethinkdb,KSanthanam/rethinkdb,wkennington/rethinkdb,nviennot/rethinkdb,marshall007/rethinkdb,wkennington/rethinkdb,wkennington/rethin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