fix truly bewildering bug causing unrelated tests to fail following multiple {{yield}} error
fix truly bewildering bug causing unrelated tests to fail following multiple {{yield}} error

ractivejs/ractive,marcalexiei/ractive,squaredup/ractive,thomsbg/ractive,ndimas/ractive,magicdawn/ractive,ISNIT0/ractive,marcalexiei/ractive,ractivejs/ractive,JonDum/ractive,magicdawn/ractive,cgvarela/ractive,pingjiang/ractive,JonDum/ractive,cgvarela/ractive,squaredup/ractive,ISNIT0/ractive,marcalexiei/ractive,pingjiang/ractive,ndimas/ractive,ractivejs/ractive,cgvarela/ractive,JonDum/ractive,squaredup/ractive,ISNIT0/ractive,thomsbg/ractive,ndimas/ractive,thomsbg/ractive,magicdawn/ractive,pingjiang/ractive