op5util does not react to <ctrl>+C when waiting for non existent $MONITOR

```
ops:~/$ op5util -u monitoruser -p secretpassword -m nonexistent.host.name hosts
^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^C^CError, 
error: 
/usr/local/bin/op5util: Interrupt
```