row is always 0 in rulerTable; more robust error checking
row is always 0 in rulerTable; more robust error checking

walterbender/musicblocks,Hrishi1999/musicblocks,eohomegrownapps/musicblocks,Hrishi1999/musicblocks,eohomegrownapps/musicblocks,eohomegrownapps/musicblocks,walterbender/musicblocks,walterbender/musicblocks,sachi-d/musicblocks,Hrishi1999/musicblocks,sachi-d/musicblocks,sachi-d/musicblocks