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sdp: accept empty attribute value represented as a NULL pointer
Some empty media attribute values are set to an empty string, others as a NULL pointer. It seems that code is able to deal with both, except for the UTF8 validation. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6119>
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@ -4257,7 +4257,7 @@ sdp_add_attributes_to_caps (GArray * attributes, GstCaps * caps)
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continue;
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/* string must be valid UTF8 */
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if (!g_utf8_validate (attr->value, -1, NULL))
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if (attr->value != NULL && !g_utf8_validate (attr->value, -1, NULL))
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continue;
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if (!g_str_has_prefix (key, "x-"))
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