Fix IndexError on tags with empty values list - #259
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A tag declaring a single non-ASCII value whose data cannot be read (e.g. truncated or corrupted file) leaves the decoded values list empty, and building the printable string crashed with IndexError. Seen in the wild on DJI M3E MakerNote tags. Guard the zero-index access and add a minimal synthetic sample image reproducing the DJI MakerNote case, with a regression test.
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Fixes #254
A tag declaring a single non-ASCII value whose data cannot be read (truncated or corrupted file) leaves the decoded values list empty, and building the printable string crashed with
IndexError. Seen in the wild on DJI M3E MakerNote tags.This guards the zero-index access so the tag decodes to an empty printable instead. Includes a minimal synthetic sample image reproducing the DJI MakerNote case and a regression test; the dump reference is updated accordingly.