RMAN-20242

This is the error.  Thsi daatbase does not have much activity.  There will not necessarily be any archivelogs when the backup occurs.  I have archivelogs with sysdate-7. 

Is there a way to test for the existance of archivelogs, so the job does not fail?  Can a v$table be accessed to make that determination - v$log_history or v$archive_logs? 

Starting backup at 06-JUL-11
using channel ORA_DISK_1
using channel ORA_DISK_2
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 07/06/2011 13:16:19
RMAN-20242: specification does not match any archive log in the recovery catalog