Correcting the pims_split metadata and dag files to iterate over the splits
Added an iteration over {{#splits}} to the metadata file and removed an unnecessary check of the quicklook_url in the dag (it's okay to pass an empty string there).
The splits entry should look like:
"splits": [
{
"split_dir": {{split_dir}},
"quicklook_url": {{quicklook_url}}
},
]