combination of valid/invalid files success in /convert/office

[arun-cts]

when invoking the /convert/office endpoint, I send a list of files (POST form-data)

if all are valid (office format etc.), the call succeeds with 200 OK
if one or more are invalid (e.g. .zip file) the call still succeeds with 200 OK - it should return 206 PARTIAL CONTENT or 400 Bad Request

[gulien]

Actually it will search for all files with a valid format. It returns a 400 Bad Request only if it did not found any files.

For instance:

• you send one .docx and one .zip file
• Gotenberg will convert the .docx file and ignore the .zip file
• you send only a .zip file
• Gotenberg returns a 400 Bad Request