fit LCs iteratively crashes when no velocity aberration model is fitted

[jorgemarpa]

When doing fit_lightcurve(fit_va=False, iter_negative=True) this will crash in the following line:

psfmachine/src/psfmachine/tpf.py

Line 117 in 3edb591

negative_sources = (self.ws_va < 0).sum(axis=0) > (0.02 * self.nt)

because the variable self.ws_va does not exist.

Is the iterative fitting meant to work only when fitting the velocity aberrations?

[christinahedges]

I concur this is a bug