schema: remove error after lyd_value_validate_dflt call

libyang returns the realtype field when the store callback return code
is LY_SUCCESS and LY_EINCOMPLETE.
Don't raise an error when lyd_value_validate_dflt returns
LY_EINCOMPLETE. The function can then use the val_type_cdata field.

Link: https://github.com/CESNET/libyang/blob/master/src/tree_data_common.c#L682
Signed-off-by: Jeremie Leska <[email protected]>

Author: jeremie6wind

libyang/schema.py

@@ -1545,7 +1545,7 @@ def default(self) -> Union[None, bool, int, str, float]:
                 val_type_cdata,
                 ffi.NULL,
             )
-            if ret != lib.LY_SUCCESS:
+            if ret not in (lib.LY_SUCCESS, lib.LY_EINCOMPLETE):
                 raise self.context.error("Unable to get real type of default value")
             self.cdata_default_realtype = Type(self.context, val_type_cdata[0], None)