[Tilesathome] invalid tiles

[Andreas Kemnade]

Hi,

after trashing parts of my t at h tile cache of mumpot with gfx files containing
the text "unknown type" during updating of it. I would like to avoid overwriting
my old tile data with invalid data. Is there any way to recognize such
invalid tiles, so that they can be thrown away?

Greetings
Andreas Kemnade
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