### Motivation There is a probable race condition in [the alloy upgrade job helper](https://repo1.dso.mil/big-bang/product/packages/alloy/-/blob/main/chart/templates/bigbang/upgrade/_helpers.tpl?ref_type=heads). In certain situations, the `lookup` can occur before the flux helm controller has had a chance to post back a status to the `HelmRelease` CR. This can result in a situation where templating fails by trying to index a field that is `nil`. [pipeline link here](https://repo1.dso.mil/big-bang/bigbang/-/jobs/46300944) ### Acceptance Criteria - [ ] Edge cases where no helmrelease history is available should fail gracefully and assume no upgrade needs to take place.