[Bundle Caching][API] When doing pull comparison handle head commit not exist

[JerrySentry]

If a commit never uploaded any bundle stat files (due to all bundles were being cached) we want to show the parent commit's data. In this case when doing the comparison set the head commit to the base commit

In resolve_bundle_analysis_compare_with_base

if not pull.head:
    bundle_analysis_comparison = load_bundle_analysis_comparison(
        Commit.objects.filter(commitid=pull.compared_to).first(),
        Commit.objects.filter(commitid=pull.compared_to).first(),
    )

Note that this could be misleading because after they make a PR but before the uploads are done yet they think there's no change in the bundles

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1. [Bundle Caching][API] Add resolvers to return whether a bundle is cached or not. #2035
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