Inserting a dummy value for empty field while parsing using grok logstash

Elastic Stack Logstash
1

I want to have the dummy value for empty field while parsing grok pattern.
I have used the following condition-->
if ![exception_stacktrace] {
mutate {
replace => [ "exception_stacktrace", "-" ]
}
}
But with this my grok pattern is not working if exception_stacktrace is present.

2

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