[poppler] Inconsistent error message

[Jacob Marble]

Good afternoon-

I'm using the Poppler GLib API, just getting started. Please comment on
proper error handling procedures for client code.

GError error;
doc = poppler_document_new_from_file(uri, NULL, &error);

When the file identified by uri does not exist,
poppler_document_new_from_file returns NULL, and error is set to:
{ G_FILE_ERROR, G_FILE_ERROR_FAILED, "No error" }

Relying on only the message portion "No error", the user learns nothing
helpful. Should I consider this a bug in Poppler, or should my code always
check for "No error" and subsequently assemble a message based on the error
domain and code?

Thanks

Jacob Marble
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