fix: prevent 0 batch size

[cspargo]

• I swapped the order of these two clauses, because going by the comments, I think the intention is that the batch size should always be at least 1, however because the ASG size is 0, the batch size was getting set to 0
• i have tested in our environment that this resolves the problem we were seeing and otherwise works as before
• fixes #347

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 49.04%. Comparing base (0f21bef) to head (2842ef1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #348 +/- ## ======================================= Coverage 49.04% 49.04% ======================================= Files 7 7 Lines 891 891 ======================================= Hits 437 437 Misses 412 412 Partials 42 42 ```

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