JetMatcherAlg - add protection in case no JFEX L1 jet container is available (ATR-25147)

Peter Sherwoodrequested to merge
peter/athena:master-25147 into master

JetMatcherAlg add protection in case no JFEX L1 jet container is available.

@sawyer @schaarsc @ayana @cantel @peter

Tagging ATR-25147

Edited by Claire Antel

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