History code always outputs an "empty" zero timestep

[peverwhee]

What happened?

regardless of whether you set write_nstep0 to true or false, you always end up with an erroneous nstep=0 sample written to the history file (where the data for the history variables is just 0)

1. If set to true, you get two nstep=0 samples (one "accurate" and one zeroes)
2. If set to false, you get one nstep=0 sample with variables = 0

What are the steps to reproduce the bug?

Run the regression tests and inspect the history output - https://escomp.github.io/CAM-SIMA-docs/development/cam-testing/#regression-testing

What CAM-SIMA hash were you using?

sima0_00_002

What machine were you running CAM-SIMA on?

CISL machine (e.g. cheyenne)

What compiler were you using?

GNU

Path to a case directory, if applicable

No response

Will you be addressing this bug yourself?

Yes

Extra info

No response