Error caused by attempting to register multiple catalogs with the same
catalog ID. This would happen when multiple asset libraries would use
the same catalog definition file, and the "All" library would attempt to
merge them all into one library.
Ignore duplicate catalogs, like we already do when reading individual
asset catalog definition files. Log an error instead, or a info log if
the catalog path matches as well (in which case the conflict can be
ignored as it won't be user visible).
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