return early if no data

Author: Matic Lubej

eolearn/mask/snow_mask.py

@@ -66,6 +66,10 @@ def _apply_dilation(self, snow_masks: np.ndarray) -> np.ndarray:
 
  def execute(self, eopatch: EOPatch) -> EOPatch:
  bands = eopatch[self.bands_feature][..., self.band_indices]
+ if bands.shape[0] == 0:
+ eopatch[self.mask_feature] = np.zeros((*bands.shape[:-1], 1), dtype=bool)
+ return eopatch
+
  with np.errstate(divide="ignore", invalid="ignore"):
  # (B03 - B11) / (B03 + B11)
  ndsi = (bands[..., 0] - bands[..., 3]) / (bands[..., 0] + bands[..., 3])