Revert "edited Coord.copy"

This reverts commit 6ed270d.

lib/iris/coords.py

@@ -200,7 +200,7 @@ def _sanitise_array(self, src, ndmin):
             else:
                 extended_shape = tuple([1] * ndims_missing + list(src.shape))
                 result = src.reshape(extended_shape)
-        elif src is None:
+        else:
             # Real data : a few more things to do in this case.
             # Ensure the array is writeable.
             # NB. Returns the *same object* if src is already writeable.
@@ -1535,10 +1535,6 @@ def copy(self, points=None, bounds=None):
         """
         if points is None and bounds is not None:
             raise ValueError("If bounds are specified, points must also be specified")
-        if points is None and iris.FUTURE.dataless_cube:
-            # dataless coords are not currently implemented, so points should never
-            # be removed in a copy
-            points = iris.MAINTAIN_DATA
 
         new_coord = super().copy(values=points)
         if points is not None: