allow none

Author: poplarShift

param/__init__.py

@@ -1729,6 +1729,9 @@ def __init__(self, default=None, dims=None, coords=None, **params):
 
 
     def _validate(self, val):
+        if self.allow_None and val is None:
+            return
+
         super(DataArray, self)._validate(val)
         self._validate_dims_coords(val)
 
@@ -1763,6 +1766,9 @@ def __init__(self, default=None, dims=None, coords=None, data_vars=None,
 
 
     def _validate(self, val):
+        if self.allow_None and val is None:
+            return
+            
         super(Dataset, self)._validate(val)
 
         self._validate_dims_coords(val)