Queries hang when S3 storage plugin is enabled and config is incomplete

I added an S3 storage plugin and was able to query files successfully. I modified the config to remove my security keys. I might have also updated my build to 1.7.0 (from 1.6.0).

After the change, I was unable to execute any queries. "Show schemas" and all other queries hang and no error message was thrown. Log indicates an issue with loading the S3 classes.

Log snippets (relevant log attached):

2016-04-27 11:00:06,575 [28df01d9-7921-215c-81ec-a8ff014f4513:foreman] INFO  o.a.drill.exec.work.foreman.Foreman - Query text for query id 28df01d9-7921-215c-81ec-a8ff014f4513: show schemas
2016-04-27 11:00:06,585 [drill-executor-3] ERROR o.a.d.exec.server.BootStrapContext - org.apache.drill.exec.work.foreman.Foreman.run() leaked an exception.
java.lang.NoClassDefFoundError: org/jets3t/service/S3ServiceException

After updating the S3 plugin with complete config, I was able to resolve the issue.