Safari 11.1: ajax/XHR form submission fails when input[type=file] is empty

Question

UPDATE: As of Webkit build r230963, this issue has been resolved in Webkit.

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Since the recent Safari 11.1 update on macOS and iOS, as

Answer 1

    var fileNames = formData.getAll("filename[]");
    formData.delete("filename[]");
    jQuery.each(fileNames, function (key, fileNameObject) {
        if (fileNameObject.name) {
            formData.append("filename[]", fileNameObject);
        }
    });

Try this !!