baseparse: don't post loads of empty taglists
baseparse: don't post loads of empty taglists

Only post bitrate updates if there's something to post, don't
post empty taglists if nothing changed.

magcius/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,krieger-od/gstreamer,collects/gstreamer,StreamUtils/gstreamer,mparis/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,shelsonjava/gstreamer,magcius/gstreamer,jpxiong/gstreamer,drothlis/gstreamer,StreamUtils/gstreamer,centricular/gstreamer,lovebug356/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,jpakkane/gstreamer,lubosz/gstreamer,lovebug356/gstreamer,Lachann/gstreamer,ensonic/gstreamer,ylatuya/gstreamer,ylatuya/gstreamer,ylatuya/gstreamer,cfoch/gstreamer,krichter722/gstreamer,Distrotech/gstreamer,mparis/gstreamer,ylatuya/gstreamer,jpxiong/gstreamer,mparis/gstreamer,krichter722/gstreamer,cfoch/gstreamer,ensonic/gstreamer,Distrotech/gstreamer,collects/gstreamer,jpakkane/gstreamer,cablelabs/gstreamer,mparis/gstreamer,ahmedammar/platform_external_gst_gstreamer,jpxiong/gstreamer,centricular/gstreamer,drothlis/gstreamer,Lachann/gstreamer,shelsonjava/gstreamer,justinjoy/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,centricular/gstreamer,lubosz/gstreamer,shelsonjava/gstreamer,jpakkane/gstreamer,ahmedammar/platform_external_gst_gstreamer,justinjoy/gstreamer,surround-io/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,centricular/gstreamer,krichter722/gstreamer,magcius/gstreamer,centricular/gstreamer,magcius/gstreamer,magcius/gstreamer,Lachann/gstreamer,Lachann/gstreamer,drothlis/gstreamer,lovebug356/gstreamer,StreamUtils/gstreamer,cfoch/gstreamer,collects/gstreamer,lovebug356/gstreamer,surround-io/gstreamer,cablelabs/gstreamer,krieger-od/gstreamer,collects/gstreamer,justinjoy/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,StreamUtils/gstreamer,lubosz/gstreamer,ylatuya/gstreamer,lubosz/gstreamer,cfoch/gstreamer,ahmedammar/platform_external_gst_gstreamer,drothlis/gstreamer,collects/gstreamer,ahmedammar/platform_external_gst_gstreamer,justinjoy/gstreamer,jpakkane/gstreamer,Lachann/gstreamer,ensonic/gstreamer,Distrotech/gstreamer,mparis/gstreamer,ahmedammar/platform_external_gst_gstreamer,jpakkane/gstreamer,StreamUtils/gstreamer,krieger-od/gstreamer,Distrotech/gstreamer,cfoch/gstreamer,surround-io/gstreamer,surround-io/gstreamer,Distrotech/gstreamer,ensonic/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,drothlis/gstreamer