ca-derivations: fix rendering issue #1374
Merged
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See commit messages for some more background and analysis.
I set up my hydra server with the recent content-addressed derivations support, and ran into some /build/<id> pages that didn't want to render correctly (not only ca-derivations, other pages also suffered from this). I think I found the issue and have worked around/resolved it.
Also adds a test that verifies that the page doesn't load properly before the patch is applied. In the next commit this bug is resolved.