Rescaling FluxPerAngle Profile Fails with Attribute Error

[Snyder005]

I have encountered the following issue while attempting to rescale a FluxPerAngle profile using the FluxPerAngle.rescale() method if it was previously initialized with a scale.

The code to recreate the issue is

defocus_profile = FluxPerAngle(550., LSST, LSSTSEEING, scale=old_scale)
defocus_profile.rescale(new_scale)

AttributeError                            Traceback (most recent call last)
<ipython-input-103-f51bc1bc45e7> in <module>
----> 1 defocus_profile.rescale(scale)

~/anaconda3/lib/python3.8/site-packages/lfd/analysis/profiles/convolutionobj.py in rescale(self, x, y, step)
    129         # must be called before update so that scaleleft and scaleright
    130         # remain unchanged from the original
--> 131         self.obj = self.f(newscale)
    132         self.scale = newscale
    133         self.update()

~/anaconda3/lib/python3.8/site-packages/lfd/analysis/profiles/defocusing.py in f(self, r, h, instrument, units)
     77 
     78         if not all([h, Ro, Ri]):
---> 79             h = self.h
     80             Ro = self.Ro
     81             Ri = self.Ri

AttributeError: 'FluxPerAngle' object has no attribute 'h'

This is due to the fact that the assignment of h (as well as Ro and Ri) only occurs if scale=None during the object creation. See the following:

def __init__(self, h, instrument, scale=None, units="arcsec", res=0.001,
                 **kwargs):
        if scale is None:
            self.h = h
            self.Ro, self.Ri = instrument
            thetao = self.Ro / (h * 1000000.)
            radscale = np.arange(-2*thetao, 2*thetao, thetao*res)
            scale = np.multiply(radscale, RAD2ARCSEC)
        obj = self.f(scale, h, instrument, units=units)

        ConvolutionObject.__init__(self, obj, scale)