[pygobject/set-value-unify: 2/3] Value.set_value: allow None for TYPE_STRING

[Christoph Reiter <creiter src gnome org>]

commit b66e964ec1b27d5786d2e2276d18764df6a06e6c
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sat Jan 19 13:43:28 2019 +0100

    Value.set_value: allow None for TYPE_STRING
    
    set_string() allows it too

 gi/overrides/GObject.py         | 4 ++--
 tests/test_overrides_gobject.py | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/gi/overrides/GObject.py b/gi/overrides/GObject.py
index 04b5be65..20a92b0e 100644
--- a/gi/overrides/GObject.py
+++ b/gi/overrides/GObject.py
@@ -258,8 +258,8 @@ class Value(GObjectModule.Value):
         elif gtype == TYPE_DOUBLE:
             self.set_double(py_value)
         elif gtype == TYPE_STRING:
-            if isinstance(py_value, str):
-                py_value = str(py_value)
+            if py_value is None or isinstance(py_value, str):
+                py_value = py_value
             elif PY2:
                 if isinstance(py_value, text_type):
                     py_value = py_value.encode('UTF-8')
diff --git a/tests/test_overrides_gobject.py b/tests/test_overrides_gobject.py
index 47759b41..e62a27fd 100644
--- a/tests/test_overrides_gobject.py
+++ b/tests/test_overrides_gobject.py
@@ -222,8 +222,8 @@ def test_value_string():
     assert v.get_value() == u"quux"
     assert isinstance(v.get_value(), str)
 
-    with pytest.raises(TypeError):
-        v.set_value(None)
+    v.set_value(None)
+    assert v.get_value() is None
 
 
 def test_value_pyobject():