Avoid SystemError on inserting an empty list insert to header from python

diff --git a/python/header-py.c b/python/header-py.c
index 3482dd2..6d6c1e9 100644 (file)
--- a/python/header-py.c
+++ b/python/header-py.c
@@ -510,6 +510,8 @@ static int validData(rpmTagVal tag, rpmTagType type, rpmTagReturnType retype, Py
     } else if (retype == RPM_ARRAY_RETURN_TYPE && PyList_Check(value)) {
        /* python lists can contain arbitrary objects, validate each item */
        Py_ssize_t len = PyList_Size(value);
+       if (len == 0)
+           valid = 0;
        for (Py_ssize_t i = 0; i < len; i++) {
            PyObject *item = PyList_GetItem(value, i);
            if (!validItem(tclass, item)) {