[pybank] Handle returned NULL strings

[Johan Dahlin <johan src gnome org>]

commit 54b6c0eae058044a17c87b26b20ea33316118589
Author: Tomeu Vizoso <tomeu sugarlabs org>
Date:   Fri May 8 15:07:10 2009 +0200

    Handle returned NULL strings
---
 bank/bank-argument.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/bank/bank-argument.c b/bank/bank-argument.c
index ecd3def..97ac87d 100644
--- a/bank/bank-argument.c
+++ b/bank/bank-argument.c
@@ -190,14 +190,16 @@ pyg_argument_to_pyobject(GArgument *arg, GITypeInfo *type_info)
 	obj = PyFloat_FromDouble(arg->v_double);
 	break;
     case GI_TYPE_TAG_UTF8:
-	obj = PyString_FromString(arg->v_pointer);
+        if (arg->v_string == NULL)
+	    obj = Py_None;
+	else
+            obj = PyString_FromString(arg->v_string);
 	break;
     case GI_TYPE_TAG_INTERFACE:
 	obj = PyCObject_FromVoidPtr(arg->v_pointer, NULL);
 	break;
     case GI_TYPE_TAG_ARRAY:
 	obj = Py_None;
-	Py_INCREF(Py_None);
 	break;
     default:
 	g_print("<GArg->PyO> GITypeTag %s is unhandled\n",