The configtree render function includes empty parentheses following a valueless node (example below): this is apparent in 'compare', and would be apparent in the saved config file after T4292 without the proposed fix. The suggested change to the render function also fixes an issue with indenting in tag nodes. The result is formatting that will be similar to that of the legacy code, as had been requested.
Current:
```
vyos@vyos# set service ssh disable-host-validation
vyos@vyos# compare
[service ssh]
+ disable-host-validation { }
```
Proposed:
```
vyos@vyos# set service ssh disable-host-validation
vyos@vyos# compare
[service ssh]
+ disable-host-validation
```