FragilityFunctionDiscrete can not handle list properly

[dynaryu]

Noticed that FragilityFunctionDiscrete can not handle list or array properly as below:
a = FragilityFunctionDiscrete(limit_state='slight', imls= [0.0, 0.2, 0.4, 0.6, 0.8, 1, 1.2, 1.4], poes = [0.0, 0.771, 0.95, 0.989, 0.997, 0.999, 1., 1.], no_damage_limit=0.05)
It works okay when it takes a single value, but it fails when it takes array and yields a wrong value if it takes a list:

a(0.4)
a([0.2, 0.4])
a(numpy.array([0.2, 0.4]))

I changed the code as below to fix the error:
`class FragilityFunctionDiscrete(object):

def __call__(self, iml):
    """
    Compute the Probability of Exceedance (PoE) for the given
    Intensity Measure Level (IML).
    """
    highest_iml = self.imls[-1]

    # when the intensity measure level is above
    # the range, we use the highest one
    try:
        iml = [highest_iml if x > highest_iml else x for x in iml]
    except TypeError:
        temp = self.interp(highest_iml if iml > highest_iml else iml)
    else:
        temp = self.interp(iml)

    if self.no_damage_limit:
         temp[iml < self.no_damage_limit] = 0.0
    return temp

`