Fix gst_props_get_entry(): props==NULL is a valid props.
Fix gst_props_get_entry(): props==NULL is a valid props.

Original commit message from CVS:
Fix gst_props_get_entry(): props==NULL is a valid props.

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