missing coordinates JSON property in issues of METS/ALTO importer

[e-maud]

In the issues files of the canonical data produced with the RERO METS/ALTO importer, the c (coordinates) property is missing in the m object.

This bug was noticed during image import for image similarity computation. Since the IIIF link is not in the issues file (as it is the case for BNL data), one needs to rebuild it and therefore need the coordinates.

For example, in the DTT-1940-issues.jsonl.bz2, the following items does not have the c:

"m": {
        "id": "DTT-1940-01-02-a-i0044",
        "tp": "image",
        "pp": [
          6
        ],
        "t": "UNKNOWN"
      },

[mromanello]

to be checked whether the coords are there in the source file;