outputselector: Improve get and set caps functions
outputselector: Improve get and set caps functions

Improve sink pad getcaps and setcaps by handling the case where
no src pads exist yet

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