Original commit message from CVS:
* gst/gstvalue.c: (gst_value_serialize_buffer),
(gst_value_deserialize_buffer):
Don't try to serialize a GValue with a NULL buffer.
Fixes #339821.
* tests/check/gst/gstvalue.c: (GST_START_TEST), (gst_value_suite):
Added check for serialisation of NULL buffers.