Added check to cause a parseError when tabstave's options are both set to false.
Added check to cause a parseError when tabstave's options are both set to false.

willduff/vexflow,burnnat/vexflow,CaveMike/vexflow,cute/vexflow-musicxml,aaronmars/vexflow,streuth/vexflow,DigitalCoder/vexflow,cpill0789/vexflow,winning1120xx/vexflow,Nairam/vexflow,zz85/vexflow,mehano/vexflow,amitgur/vexflow,aaronmars/vexflow,liuyang1204/vexflow,velochy/vexflow,willduff/vexflow,dfcreative/vexflow,humnotation/vexflow,voidest1/vexflow,jmahmud/vexflow,Chipairon/vexflow,jimaltieri/vexflow,Tails/vexflow,johndpope/vexflow,humnotation/vexflow,danjones/vexflow,gaborveszpremi/vexflow,ravenac95/vexflow,natedsaint/vexflow,wiseleyb/vexflow,redreamality/vexflow,zan2434/comuse,zan2434/comuse,squidsoup/vexflow,nybbs2003/vexflow,niklasgrahl/vexflow,Mdonmounts/vexflow,zex713/vexflow,cgamache/vexflow,Mdonmounts/vexflow,lumimies/vexflow,springzh/vexflow,bsouthward/vexflow,winning1120xx/vexflow,mportiz08/vexflow,RSid/vexflow,aerhard/vexflow,lasconic/vexflow-musicxml,FatPanther/vexflow,natedsaint/vexflow,velochy/vexflow,jdowner/vexflow,fgeorgy/vexflow,Fabrico/vexflow,vmoll/vexflow,fabienric/vexflow,liuyang1204/vexflow,smarmit/vexflow,Charlie-Wellesley/vexflow,ssoRL/vexflow,rochbu/vexflow,3logy/vexflow,ohoushyar/vexflow,guert/vexflow,muratcorlu/vexflow,tschmidt23/vexflow,nybbs2003/vexflow,aaronmars/scottish-writer,mcanthony/vexflow,petehamilton/vexflow,dfcreative/vexflow,Agamnentzar/vexflow,alexmao86/vexflow,voidest1/vexflow,zhhz/vexflow,jdowner/vexflow,raffazizzi/vexflow,fabienric/vexflow,Daremyth/vexflow,fgeorgy/vexflow,JanvanCasteren/vexflow,zhhz/vexflow,lasconic/vexflow-musicxml,wander2001/vexflow,Huji/vexflow,ssoRL/vexflow,avorio/vexflow,CaveMike/vexflow,nybbs2003/vexflow,clecap/vexflow-musicxml,springzh/vexflow,rochbu/vexflow,spencerhitch/vexflow_extended,humnotation/vexflow,wiseleyb/vexflow,zz85/vexflow,pinxue/vexflow,guert/vexflow,JasonLil/vexflow,voidest1/vexflow,vikeen/vexflow,IcculusC/vexflow,andrewdouglas/vexflow,miniplex/vexflow,ohoushyar/vexflow,JanvanCasteren/vexflow,andrewdouglas/vexflow,Tails/vexflow,Daremyth/vexflow,rukor/vexflow,zachledoux/vexflow,incompleteopus/vexflow,FatPanther/vexflow,gaborveszpremi/vexflow,zex713/vexflow,mcanthony/vexflow,petehamilton/vexflow,cute/vexflow-musicxml,fabienric/vexflow,bpartridge/vexflow,cgamache/vexflow,ssoRL/vexflow,guert/vexflow,CaveMike/vexflow,Chipairon/vexflow,LarryKu/vexflow,Fabrico/vexflow,redreamality/vexflow,jonens/vexflow,bsouthward/vexflow,mwicat/vexflow,smarmit/vexflow,toni07/vexflow,LarryKu/vexflow,zolaemil/vexflow,Huji/vexflow,cdosborn/vexflow,Kosar79/vexflow,jbernie2/vexflow,Nairam/vexflow,Chipairon/vexflow,springzh/vexflow,Agamnentzar/vexflow,Silverwolf90/vexflow,lasconic/vexflow-musicxml,wuqi/vexflow,dhruvrajan/vexflow,toni07/vexflow,avorio/vexflow,FatPanther/vexflow,incompleteopus/vexflow,muratcorlu/vexflow,trinketapp/vexflow,cpill0789/vexflow,clecap/vexflow-musicxml,burnnat/vexflow,winning1120xx/vexflow,LarryKu/vexflow,jbernie2/vexflow,danjones/vexflow,zan2434/comuse,3logy/vexflow,liuyang1204/vexflow,alexmao86/vexflow,niklasgrahl/vexflow,rukor/vexflow,raffazizzi/vexflow,natedsaint/vexflow,gaborveszpremi/vexflow,tschmidt23/vexflow,cpill0789/vexflow,mehano/vexflow,ecompositor/vexflow,Tails/vexflow,bpartridge/vexflow,Nairam/vexflow,jimaltieri/vexflow,bwbohl/vexflow,mariushe/vexflow,fgeorgy/vexflow,arthurian/vexflow,raffazizzi/vexflow,redreamality/vexflow,zex713/vexflow,burnnat/vexflow,niklasgrahl/vexflow,mwicat/vexflow,ecompositor/vexflow,arthurian/vexflow,dhruvrajan/vexflow,zolaemil/vexflow,RSid/vexflow,mehano/vexflow,jonens/vexflow,cute/vexflow-musicxml,trinketapp/vexflow,shuanzi/vexflow,petehamilton/vexflow,bwbohl/vexflow,arthurian/vexflow,rochbu/vexflow,alexmao86/vexflow,lumimies/vexflow,lumimies/vexflow,avorio/vexflow,JanvanCasteren/vexflow,cdosborn/vexflow,spencerhitch/vexflow_extended,Kosar79/vexflow,Kosar79/vexflow,aaronmars/scottish-writer,miniplex/vexflow,DigitalCoder/vexflow,jdowner/vexflow,ravenac95/vexflow,bsouthward/vexflow,dfcreative/vexflow,squidsoup/vexflow,wander2001/vexflow,Agamnentzar/vexflow,wuqi/vexflow,GunioRobot/vexflow,jimaltieri/vexflow,bpartridge/vexflow,cute/vexflow-musicxml,jmahmud/vexflow,DigitalCoder/vexflow,Silverwolf90/vexflow,aaronmars/scottish-writer,vikeen/vexflow,Huji/vexflow,shuanzi/vexflow,mportiz08/vexflow,jcrogel/vexflow,Daremyth/vexflow,jmahmud/vexflow,vmoll/vexflow,streuth/vexflow,vmoll/vexflow,squidsoup/vexflow,mcanthony/vexflow,mariushe/vexflow,zz85/vexflow,trinketapp/vexflow,willduff/vexflow,cgamache/vexflow,ringw/vexflow,jonens/vexflow,Charlie-Wellesley/vexflow,jcrogel/vexflow,aaronmars/vexflow,3logy/vexflow,toni07/vexflow,andrewdouglas/vexflow,johndpope/vexflow,miniplex/vexflow,incompleteopus/vexflow,ecompositor/vexflow,Fabrico/vexflow,cdosborn/vexflow,bwbohl/vexflow,wander2001/vexflow,GunioRobot/vexflow,JasonLil/vexflow,pinxue/vexflow,Petezah/vexflow,smarmit/vexflow,GunioRobot/vexflow,muratcorlu/vexflow,ravenac95/vexflow,mwicat/vexflow,clecap/vexflow-musicxml,zolaemil/vexflow,IcculusC/vexflow,danjones/vexflow,Mdonmounts/vexflow,aerhard/vexflow,mportiz08/vexflow,JasonLil/vexflow,IcculusC/vexflow,streuth/vexflow,amitgur/vexflow,Petezah/vexflow,aerhard/vexflow,pinxue/vexflow,amitgur/vexflow,clecap/vexflow-musicxml,rukor/vexflow,Charlie-Wellesley/vexflow,wuqi/vexflow,spencerhitch/vexflow_extended,jcrogel/vexflow,wiseleyb/vexflow,velochy/vexflow,zachledoux/vexflow,dhruvrajan/vexflow,tschmidt23/vexflow,toni07/vexflow,Petezah/vexflow,Silverwolf90/vexflow,ohoushyar/vexflow