Don't drop the last character of Image Description, or ascii in general
Don't drop the last character of Image Description, or ascii in general

I'm finding that some exif strings are NULL terminated and some
aren't.  Avoid the "TODO: but I'm not sure why", by always reading the
value length characters and then removing from the first NULL or any
terminating spaces.  I see the "motion" webcam motion detection
program will NULL terminate dates, but not Image Description, and
previously "iNumValues - 1" would truncate the last character.

mattburns/exiftool.js,mattburns/exiftool.js