Fix the two bugs identified by Yusra in
1. When exposures have different sized PSFs in different bands it fails AFW fails to make a PSF image.
2. Some sources have so little flux that the sum of flux across all bands is less than zero, indicating that the source is just noise.
To fix (1) the plan is to fix afw.MultibandExposure.computePsfImage in meas_extensions_scarlet.deblend for the current sprint, and implement the change into afw next week.
To fix (2) the plan is to skip all sources that are too faint to be initialized as a PointSource.