Work aspect list of publication does not show publication if ordinal number for author is not set

[fnielsen]

Describe the bug
Work aspect list of publication does not show publication if ordinal number for author is not set

To Reproduce
Steps to reproduce the behavior:

1. Go tohttps://scholia.toolforge.org/author/Q50390494#list-of-publications
2. No publications are shown in the table

Expected behavior
Three publications should be shown.

Screenshots

Additional context

Make ordinal optional:

  # By standard GROUP_CONCAT does not sort, but BlazeGraph seems to sort.
  SELECT
    ?work ?author ?author_label
  WHERE {
    ?work wdt:P50 target: .
    ?work p:P50 ?work_statement .
    ?work_statement ps:P50 ?author .
    OPTIONAL {
      ?work_statement pq:P1545 ?order  .
      BIND(xsd:integer(?order) AS ?n)
    }
    OPTIONAL {
      ?author rdfs:label ?author_label_ . FILTER (LANG(?author_label_) = 'en')
    }
    BIND(COALESCE(?author_label_, SUBSTR(STR(?author), 32)) AS ?author_label)
  }
  ORDER BY ?n