Cannot read properties of undefined (reading 'toFixed') 
**Describe the bug**
At starting the server and/or at radom times (not sure for the last one) we may get TypeError: Cannot read properties of undefined (reading 'toFixed') 

**To Reproduce**
Enable recording start the server.

**Expected behavior**
Record

**Logs**
 

**Screenshots**
 

**Environment**
- Node.js Version: v16.15.0
- Camera UI Version: v17
- Operating System: win10
- Browser: XXX

Seems it is caused by this piece of (Orphan?) code at the event.cotroller.js

          if (!allowRecording) {
                log.warn(
                  `The available disk space is less than 1 GB (${diskSpace.available.toFixed(2)
                  } GB)! Please free up disk space to be able to create new recordings!`,
                  cameraName
                );

                log.info('Skip local storage of the recording..', cameraName);
              }
