Reading boundary files that are not associated with with a namelist object.

Hi fdsreader team,

Thank for developing this package, hopefully this is the correct location to post this 'issue'. I am attempting to analyse the 'Burning Rate' boundary quantity within a level set grass simulation (I've attached a simplified version of the code). Currently running on FDS version 6.8.0.

I have used this package previously to plot the boundary quantities associated with objects previously without issue. I believe the issue occurs because there are no objects specified in my namelist i.e 'sim.obstructions' is 0. The boundary quantity is calculated at what would be considered a vent at the base of the domain as opposed to an object. Hopefully this makes sense.

Do you have any advice on what to do for this scenario?

Many thanks for the help.
[LS_INITIAL_3M.txt](https://github.com/user-attachments/files/16421856/LS_INITIAL_3M.txt)