## Copy Unhandled

This function is used to copy the first unhandled frame of a particular type to a specified field and then optionally removes it. The function only makes sense if you know that the unhandled frame contains human readable data. If the binary data cannot be converted to readable data it will be treated as an empty string.

If a matching unhandled item cannot be found, the field will be set to empty.

Note that this function works best on mp3 files where the unhandled data is clearly delimited. In MPEG-4 files, unhandled frames are kept intact as there may be contained binary atoms that we are unaware of.