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 upgrade never completes if ASG size is 0 #347

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

@@           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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