Dask empty DataFrames aren't really empty

[smcguire-cmu]

In places where we create an empty dask DataFrame, such as in a soft association table or after a filter that doesn't create any partitions, we don't actually make an empty Dask DataFrame. In dask versions < 2024.3.0 without dask expressions dask would make a single partition with the pandas empty df from the meta. In dask >= 2024.3.0, from_delayed with an empty list of inputs raises an error so with #288, we create the empty single partition ourselves. For empty catalogs with no pixels, I think it makes sense to have an empty dask df with no partitions if possible.