fixes #1535 - make xml exporting idempotent, and actually call rendering
fixes #1535 - make xml exporting idempotent, and actually call rendering

fixes regression introduced by 3742e14

istr/casperjs,casperjs/casperjs,hlr1983/casperjs,n1k0/casperjs,istr/casperjs,casperjs/casperjs,jefleponot/casperjs,casperjs/casperjs,istr/casperjs,n1k0/casperjs,casperjs/casperjs,hlr1983/casperjs,mickaelandrieu/casperjs,n1k0/casperjs,mickaelandrieu/casperjs,hlr1983/casperjs,jefleponot/casperjs,istr/casperjs,mickaelandrieu/casperjs,hlr1983/casperjs,hlr1983/casperjs,n1k0/casperjs,mickaelandrieu/casperjs,casperjs/casperjs,casperjs/casperjs,mickaelandrieu/casperjs,jefleponot/casperjs,hlr1983/casperjs,mickaelandrieu/casperjs,istr/casperjs,jefleponot/casperjs,istr/casperjs,jefleponot/casperjs,n1k0/casperjs,n1k0/casperjs,jefleponot/casperjs