updated for version 7.4.176

Problem:    Dictionary.update() thows an error when used without arguments.
	    Python programmers don't expect that.
Solution:   Make Dictionary.update() without arguments do nothing. (ZyX)

src/if_py_both.h

@@ -1918,11 +1918,17 @@ DictionaryUpdate(DictionaryObject *self, PyObject *args, PyObject *kwargs)
     }
     else
     {
-	PyObject	*obj;
+	PyObject	*obj = NULL;
 
-	if (!PyArg_ParseTuple(args, "O", &obj))
+	if (!PyArg_ParseTuple(args, "|O", &obj))
 	    return NULL;
 
+	if (obj == NULL)
+	{
+	    Py_INCREF(Py_None);
+	    return Py_None;
+	}
+
 	if (PyObject_HasAttrString(obj, "keys"))
 	    return DictionaryUpdate(self, NULL, obj);
 	else

src/testdir/test86.in

@@ -39,6 +39,7 @@ STARTTEST
 py << EOF
 d=vim.bindeval('d')
 d['1']='asd'
+d.update()  # Must not do anything, including throwing errors
 d.update(b=[1, 2, f])
 d.update((('-1', {'a': 1}),))
 d.update({'0': -1})

src/testdir/test87.in

@@ -33,6 +33,7 @@ STARTTEST
 py3 << EOF
 d=vim.bindeval('d')
 d['1']='asd'
+d.update()  # Must not do anything, including throwing errors
 d.update(b=[1, 2, f])
 d.update((('-1', {'a': 1}),))
 d.update({'0': -1})

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    176,
 /**/
     175,
 /**/