Confirm that options are valid before starting
When using the 'Sampler' or 'Checkpoint' options, if one of the entered names has a typo, an error will only be thrown once the `draw_xy_grid` loop reaches that name. This can waste a lot of time for large grids with a typo near the end of a list, since the script needs to start over and re-generate any earlier images to finish making the grid. Also fixing typo in variable name in `draw_xy_grid`.
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