Empty files

[gordonbisnor]

pdf2json has been working for me with most PDFs however I recently came across a book where the JSON files are empty of any content. Wondering if you have any idea what might cause a file to come up empty like this?

For example:

[{"number":50,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]},{"number":51,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]},{"number":52,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]},{"number":53,"pages":90,"height":1188,"width":918,"fonts":[{"fontspec":"33","size":"24","family":"Times","color":"#000000"}],"text":[]},{"number":54,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]},{"number":55,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]},{"number":56,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]},{"number":57,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]},{"number":58,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]},{"number":59,"pages":90,"height":1188,"width":918,"fonts":[],"text":[]}]

[roozgar]

put a sample file not the output