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* **Fixed** bug in ``cedar clean`` command
* The ``cedar convert`` program will now copy "pre-ARD" image metadata JSON
files to the destination directory alongside the "pre-ARD" images (GeoTIFFs
converted to NetCDF files). To prevent this behavior, pass
``--skip-metadata`` to the program.
* Changes were made in where exceptions are handled for the case where a user
requests a "pre-ARD" image that returns 0 search results (e.g., wrong time
period for sensor, bad historic coverage, etc). By default, ``Order.add``
will not raise an ``EmptyCollectionError`` when you try to add a "pre-ARD"
image that had 0 image results. You can force an error to be raised by
setting ``error_if_empty=True`` in either ``Order.add`` or
``Tracker.submit``.