basertpendpoint.c: Do not use SR packages data if packet count is 0
basertpendpoint.c: Do not use SR packages data if packet count is 0

Change-Id: I2dba4da96d48968451676d56dbfbe359c0545893

Kurento/kms-core,Kurento/kms-core,Kurento/kms-core,ESTOS/kms-core,ESTOS/kms-core,Kurento/kms-core,ESTOS/kms-core,ESTOS/kms-core