Changed reference to Property.empty to Property._empty

stonesoup/base.py

@@ -80,7 +80,7 @@ class Property:
     A default value can be specified to signify the property on the class is
     optional. As ``None`` and ``False`` are reasonable default values,
     :class:`inspect.Parameter.empty` is used to signify the argument is
-    mandatory. (Also aliased to :attr:`Property.empty` for ease)
+    mandatory. (Also aliased to :attr:`Property._empty` for ease)
 
     A description string can also be provided which will be rendered in the
     documentation.
@@ -99,7 +99,7 @@ class Property:
         and providing both will raise an error.
     default : any, optional
         A default value, which should be same type as class or None. Defaults
-        to :class:`inspect.Parameter.empty` (alias :attr:`Property.empty`)
+        to :class:`inspect.Parameter.empty` (alias :attr:`Property._empty`)
     doc : str, optional
         Doc string for property
     readonly : bool, optional
@@ -113,6 +113,9 @@ class Property:
     readonly
     _empty : :class:`inspect.Parameter.empty`
         Alias to :class:`inspect.Parameter.empty`
+    MISSING
+        A singleton to indicator a value is missing and default value
+        should be created.
     """
     _empty = inspect.Parameter.empty
     MISSING = _MISSING()