I have updated the Send Email action by setting the condition formula as {custbody_cc_emails} is not null.

In this case CC field value is {custbody_cc_emails}.

I have created another Send Email Action, where I set the condition formula as {custbody_cc_emails} is null and left the CC field in Action as blank.

In this way, 1st Send Email action will be executed, when the “custbody_cc_emails” field is not blank, and the 2nd Send Email action will be executed when the “custbody_cc_emails” field is blank.

I hope my answer will help you with NetSuite saved search issues.