fix bug with --gst-fatal-warnings when exclude_args is NULL
fix bug with --gst-fatal-warnings when exclude_args is NULL

Original commit message from CVS:
fix bug with --gst-fatal-warnings when exclude_args is NULL

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