tile_size error in extracted features.

[narminGhaffari]

I extracted features using the newer version of stamp. Here are the attributes:

- extractor
chief_ctranspath-dab38abe
 - stamp_version
 2.1.0
 - tile_size_px
 224
 - tile_size_um
256.0
 - unit
 um

During training I receive the following warning all the time. Is there something to do to avoid this?

[narminGhaffari]

For now I added:
tile_size_px = TilePixels(224)
into

  elif tile_size := feature_h5.attrs.get("tile_size_um", None):
      # Newer STAMP format
      tile_size_um = Microns(tile_size)
      coords_um = coords
      tile_size_px = TilePixels(224)

this solves the warning, but we have to fix it probably.

[georg-wolflein]

@EzicStar please look into this