[svn r64007] port 64001-64004 to trunk

--HG--
branch : trunk

py/code/frame.py

@@ -13,6 +13,8 @@ class Frame(object):
         self.raw = frame
 
     def statement(self):
+        if self.code.fullsource is None:
+            return py.code.Source("")
         return self.code.fullsource.getstatement(self.lineno)
     statement = property(statement, None, None,
                          "statement this frame is at")

py/code/testing/test_frame.py

@@ -9,6 +9,18 @@ def test_frame_getsourcelineno_myself():
     source, lineno = f.code.fullsource, f.lineno
     assert source[lineno].startswith("        return sys._getframe(0)")
 
+def test_getstatement_empty_fullsource():
+    def func():
+        return sys._getframe(0)
+    f = func()
+    f = py.code.Frame(f)
+    prop = f.code.__class__.fullsource
+    try:
+        f.code.__class__.fullsource = None
+        assert f.statement == py.code.Source("")
+    finally:
+        f.code.__class__.fullsource = prop
+
 def test_code_from_func(): 
     co = py.code.Code(test_frame_getsourcelineno_myself) 
     assert co.firstlineno