ml unit annotation breaks GUI in one special case

tested release 1.3.1 for update found this bug:

apparent_catalyst_volume = Quantity(
        type=np.dtype(np.float64),
        unit=('ml'),
        a_eln=ELNAnnotation(component='NumberEditQuantity', defaultDisplayUnit='ml'))

works

apparent_catalyst_volume = Quantity(
        type=np.dtype(np.float64),
        unit=('ml'),
        a_eln=ELNAnnotation(component='NumberEditQuantity'))

breaks the gui relates to #1929 (closed)