Avoid callback when -blocknotify is empty
Avoid callback when -blocknotify is empty

qtumproject/qtum,mruddy/bitcoin,alecalve/bitcoin,prusnak/bitcoin,achow101/bitcoin,tecnovert/particl-core,JeremyRubin/bitcoin,instagibbs/bitcoin,namecoin/namecore,pataquets/namecoin-core,jambolo/bitcoin,achow101/bitcoin,practicalswift/bitcoin,JeremyRubin/bitcoin,mm-s/bitcoin,namecoin/namecoin-core,apoelstra/bitcoin,rnicoll/dogecoin,EthanHeilman/bitcoin,particl/particl-core,cdecker/bitcoin,JeremyRubin/bitcoin,bitcoinknots/bitcoin,kallewoof/bitcoin,AkioNak/bitcoin,jamesob/bitcoin,sipsorcery/bitcoin,anditto/bitcoin,bitcoinsSG/bitcoin,sipsorcery/bitcoin,n1bor/bitcoin,bitcoinsSG/bitcoin,prusnak/bitcoin,rnicoll/bitcoin,domob1812/bitcoin,alecalve/bitcoin,cdecker/bitcoin,MeshCollider/bitcoin,Xekyo/bitcoin,Xekyo/bitcoin,GroestlCoin/bitcoin,practicalswift/bitcoin,yenliangl/bitcoin,rnicoll/dogecoin,jambolo/bitcoin,GroestlCoin/bitcoin,cdecker/bitcoin,domob1812/bitcoin,qtumproject/qtum,kallewoof/bitcoin,particl/particl-core,fujicoin/fujicoin,jambolo/bitcoin,fanquake/bitcoin,lateminer/bitcoin,lateminer/bitcoin,pataquets/namecoin-core,jnewbery/bitcoin,GroestlCoin/bitcoin,namecoin/namecore,AkioNak/bitcoin,MeshCollider/bitcoin,fanquake/bitcoin,particl/particl-core,fanquake/bitcoin,MarcoFalke/bitcoin,EthanHeilman/bitcoin,pstratem/bitcoin,kallewoof/bitcoin,bitcoinsSG/bitcoin,rnicoll/bitcoin,GroestlCoin/GroestlCoin,fanquake/bitcoin,rnicoll/bitcoin,instagibbs/bitcoin,bitcoin/bitcoin,apoelstra/bitcoin,namecoin/namecoin-core,tecnovert/particl-core,n1bor/bitcoin,jonasschnelli/bitcoin,alecalve/bitcoin,Xekyo/bitcoin,MeshCollider/bitcoin,rnicoll/dogecoin,domob1812/namecore,yenliangl/bitcoin,namecoin/namecoin-core,pstratem/bitcoin,litecoin-project/litecoin,n1bor/bitcoin,jlopp/statoshi,yenliangl/bitcoin,Xekyo/bitcoin,anditto/bitcoin,bitcoinknots/bitcoin,andreaskern/bitcoin,EthanHeilman/bitcoin,namecoin/namecoin-core,ajtowns/bitcoin,jonasschnelli/bitcoin,dscotese/bitcoin,bitcoinsSG/bitcoin,yenliangl/bitcoin,jamesob/bitcoin,pataquets/namecoin-core,fujicoin/fujicoin,Xekyo/bitcoin,ElementsProject/elements,jambolo/bitcoin,MeshCollider/bitcoin,dscotese/bitcoin,domob1812/namecore,domob1812/bitcoin,particl/particl-core,tecnovert/particl-core,rnicoll/bitcoin,andreaskern/bitcoin,AkioNak/bitcoin,lateminer/bitcoin,pstratem/bitcoin,GroestlCoin/bitcoin,achow101/bitcoin,JeremyRubin/bitcoin,rnicoll/dogecoin,mruddy/bitcoin,anditto/bitcoin,pstratem/bitcoin,jambolo/bitcoin,sstone/bitcoin,dscotese/bitcoin,AkioNak/bitcoin,cdecker/bitcoin,bitcoin/bitcoin,jlopp/statoshi,fujicoin/fujicoin,practicalswift/bitcoin,qtumproject/qtum,andreaskern/bitcoin,jlopp/statoshi,achow101/bitcoin,mruddy/bitcoin,GroestlCoin/GroestlCoin,bitcoin/bitcoin,JeremyRubin/bitcoin,instagibbs/bitcoin,mruddy/bitcoin,particl/particl-core,cdecker/bitcoin,namecoin/namecore,instagibbs/bitcoin,fujicoin/fujicoin,apoelstra/bitcoin,ElementsProject/elements,jnewbery/bitcoin,Sjors/bitcoin,apoelstra/bitcoin,domob1812/namecore,tecnovert/particl-core,jlopp/statoshi,bitcoinsSG/bitcoin,GroestlCoin/GroestlCoin,ElementsProject/elements,jnewbery/bitcoin,jamesob/bitcoin,ajtowns/bitcoin,practicalswift/bitcoin,sipsorcery/bitcoin,sipsorcery/bitcoin,qtumproject/qtum,n1bor/bitcoin,domob1812/bitcoin,litecoin-project/litecoin,ajtowns/bitcoin,mruddy/bitcoin,litecoin-project/litecoin,mm-s/bitcoin,bitcoinknots/bitcoin,rnicoll/bitcoin,kallewoof/bitcoin,dscotese/bitcoin,Sjors/bitcoin,tecnovert/particl-core,GroestlCoin/bitcoin,JeremyRubin/bitcoin,litecoin-project/litecoin,namecoin/namecore,mm-s/bitcoin,MarcoFalke/bitcoin,ElementsProject/elements,GroestlCoin/GroestlCoin,rnicoll/bitcoin,jnewbery/bitcoin,qtumproject/qtum,MarcoFalke/bitcoin,GroestlCoin/bitcoin,litecoin-project/litecoin,ajtowns/bitcoin,Xekyo/bitcoin,bitcoinknots/bitcoin,namecoin/namecore,jonasschnelli/bitcoin,particl/particl-core,jlopp/statoshi,GroestlCoin/GroestlCoin,bitcoin/bitcoin,bitcoinsSG/bitcoin,rnicoll/dogecoin,sipsorcery/bitcoin,litecoin-project/litecoin,sipsorcery/bitcoin,ElementsProject/elements,alecalve/bitcoin,kallewoof/bitcoin,MeshCollider/bitcoin,jamesob/bitcoin,fujicoin/fujicoin,jnewbery/bitcoin,yenliangl/bitcoin,MarcoFalke/bitcoin,andreaskern/bitcoin,anditto/bitcoin,bitcoinknots/bitcoin,qtumproject/qtum,Sjors/bitcoin,GroestlCoin/GroestlCoin,prusnak/bitcoin,lateminer/bitcoin,anditto/bitcoin,domob1812/bitcoin,mruddy/bitcoin,jonasschnelli/bitcoin,ajtowns/bitcoin,ajtowns/bitcoin,anditto/bitcoin,MarcoFalke/bitcoin,sstone/bitcoin,prusnak/bitcoin,apoelstra/bitcoin,lateminer/bitcoin,achow101/bitcoin,bitcoin/bitcoin,domob1812/bitcoin,sstone/bitcoin,mm-s/bitcoin,prusnak/bitcoin,apoelstra/bitcoin,instagibbs/bitcoin,pataquets/namecoin-core,namecoin/namecoin-core,lateminer/bitcoin,alecalve/bitcoin,jamesob/bitcoin,dscotese/bitcoin,mm-s/bitcoin,EthanHeilman/bitcoin,fujicoin/fujicoin,dscotese/bitcoin,mm-s/bitcoin,MeshCollider/bitcoin,pstratem/bitcoin,andreaskern/bitcoin,ElementsProject/elements,yenliangl/bitcoin,instagibbs/bitcoin,jamesob/bitcoin,namecoin/namecore,alecalve/bitcoin,jlopp/statoshi,jambolo/bitcoin,EthanHeilman/bitcoin,andreaskern/bitcoin,fanquake/bitcoin,MarcoFalke/bitcoin,sstone/bitcoin,sstone/bitcoin,AkioNak/bitcoin,jonasschnelli/bitcoin,AkioNak/bitcoin,domob1812/namecore,fanquake/bitcoin,namecoin/namecoin-core,prusnak/bitcoin,n1bor/bitcoin,n1bor/bitcoin,bitcoin/bitcoin,kallewoof/bitcoin,Sjors/bitcoin,achow101/bitcoin,qtumproject/qtum,domob1812/namecore,practicalswift/bitcoin,sstone/bitcoin,Sjors/bitcoin,tecnovert/particl-core,pataquets/namecoin-core,EthanHeilman/bitcoin,pstratem/bitcoin,cdecker/bitcoin,pataquets/namecoin-core,practicalswift/bitcoin,domob1812/namecore