Merge branch 'falco_issue323-raise-valueerror-in-remove_nan-if-data-is-nan-only' into 'develop'

Resolve "raise ValueError in remove_nan(), if data is NaN only"

See merge request !325

mlair/data_handler/data_handler_single_station.py

@@ -593,6 +593,12 @@ class DataHandlerSingleStation(AbstractDataHandler):
             non_nan_history = self.history.dropna(dim=dim)
             non_nan_label = self.label.dropna(dim=dim)
             non_nan_observation = self.observation.dropna(dim=dim)
+            if non_nan_label.coords[dim].shape[0] == 0:
+                raise ValueError(f'self.label consist of NaNs only - station {self.station} is therefore dropped')
+            if non_nan_history.coords[dim].shape[0] == 0:
+                raise ValueError(f'self.history consist of NaNs only - station {self.station} is therefore dropped')
+            if non_nan_observation.coords[dim].shape[0] == 0:
+                raise ValueError(f'self.observation consist of NaNs only - station {self.station} is therefore dropped')
             intersect = reduce(np.intersect1d, (non_nan_history.coords[dim].values, non_nan_label.coords[dim].values,
                                                 non_nan_observation.coords[dim].values))