Edward Hervey 879526b2e2 discoverer: Don't ref NULL taglist
Fixes warning introduced in 064f7bbbfac9610fd391c45091e35391b80e1212

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1200>
2021-10-20 09:47:29 +02:00
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