Fix False and None values

Author: chdemko

jsonpath_ng/jsonpath.py

@@ -792,7 +792,7 @@ def find(self, datum):
         datum = DatumInContext.wrap(datum)
 
         # Used for catching null value instead of empty list in path
-        if not datum.value:
+        if datum.value is None:
             return []
         # Here's the hack. If it is a dictionary or some kind of constant,
         # put it in a single-element list

tests/test_jsonpath.py

@@ -230,7 +230,9 @@ def test_update(parse: Callable[[str], JSONPath], expression: str, data, update_
     ("[*]", 1, [1], ["[0]"]),
     ("[*]", 1.2, [1.2], ["[0]"]),
     ("[*]", True, [True], ["[0]"]),
+    ("[*]", False, [False], ["[0]"]),
     ("[*]", "test", ["test"], ["[0]"]),
+    ("[*]", None, [], []),
     ("[*]", [1, 2, 3], [1, 2, 3], ["[0]", "[1]", "[2]"]),
     ("[*]", range(1, 4), [1, 2, 3], ["[0]", "[1]", "[2]"]),
     ("[1:]", [1, 2, 3, 4], [2, 3, 4], ["[1]", "[2]", "[3]"]),