fix for a critical when a module returns NULL on opening
fix for a critical when a module returns NULL on opening

Original commit message from CVS:
fix for a critical when a module returns NULL on opening

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