[Bug]: disp-s1 historical app crashes if a frame's sensing time count is evenly divisible by k

[philipjyoon]

Checked for duplicates

Yes - I've already checked

Describe the bug

We always use k=15. When a DISP-S1 frame contains sensing datetimes in quantity that's a multiple of k (e.g. 15, 30, 45, etc) run_disp_s1_historical_processing.py crashes. This is probably an edge condition that hadn't been anticipated.

What did you expect?

N/A

Reproducible steps

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Environment

- Version of this software [e.g. vX.Y.Z]
- Operating System: [e.g. MacOSX with Docker Desktop vX.Y]
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