If you trigger another job with the parameterized trigger plugin and the script for the other job is not approved yet, it will hang forever. 

Steps to reproduce:

1. Create a job (Job A) with a script not yet approved.
2. Create another job (Job B) with a parameterized trigger which calls the previous job (Make sure to check the option to block when building).
3. Trigger the parameterized job (Job B)

Taking a thread dump it will show that Job B is blocked until Job A is built, and since Job A requires approval it will never complete. It would be nice if the job failed with a message about the script needing to be approved.