kmsrecorderendpoint: Do not return an error when no sample is retrieved
kmsrecorderendpoint: Do not return an error when no sample is retrieved

Change-Id: Iff283c1b0cf982e1da3325ffd54f9871b75e3010

ESTOS/kms-core,TribeMedia/kms-core,TribeMedia/kms-core,ESTOS/kms-core,KurentoLegacy/gst-kurento-plugins,Kurento/kms-core,KurentoLegacy/gst-kurento-plugins,shelsonjava/kms-core,ESTOS/kms-core,Kurento/kms-core,shelsonjava/kms-core,TribeMedia/kms-core,KurentoLegacy/gst-kurento-plugins,TribeMedia/kms-core,KurentoLegacy/gst-kurento-plugins,shelsonjava/kms-core,ESTOS/kms-core,shelsonjava/kms-core,Kurento/kms-core,Kurento/kms-core