Piff catastrophically fails when PixelGrid size is larger than input star images about piff HOT 3 OPEN

Err. Just noticed that the Piff.Star objects we attached here are exactly 21x21 pixel stamps. So it's not unreasonable for Piff to fail to extrapolate to 25x25 (though maybe that'd also be a reasonable thing for Piff to warn about). We should try again with larger input stamps.

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Thank you for noticing that, @jmeyers314 ! Making sure our psf candidate sources are as large as the model size seems to have done the trick, and I'm implementing checks in our code to try to prevent this in the future.

I've updated the issue title here: PIFF should error out if the configured PixelGrid is larger than the star images that are given as input to the fitter. That would have helped us catch this earlier.

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It's hard to anticipate all the ways users can fail to use code appropriately. :) But yeah, I agree this is something that Piff should check for and give an appropriate error earlier in the process.

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