Fix CircleCI: No tests to run

[syntrust]

Fix CircleCI test error named contracts-bedrock-tests-heavy-fuzz-modified where test_list is empty:

No tests match the provided pattern:
        match-path: `./test/{}`
Error: No tests to run

Exited with code exit status 1

[blockchaindevsh]

Looks like there's already such a check here but somehow it's not exiting as expected?

[syntrust]

Looks like there's already such a check here but somehow it's not exiting as expected?

Right. exit 0 only exits from the current step, and there is no better way to break from the current job.