Don't explode when a ChangeDescription references an invalid diff.
Review Request #6094 — Created July 10, 2014 and submitted
When a diff is deleted from the database, it doesn't remove the field from any
ChangeDescription objects (since that's buried in a JSONField and there's no
relation between them). This meant that if a published revision of a diff was
deleted, rendering the ChangeDescription would explode.This change adds some bullet-proofing around the DiffField rendering to avoid
doing anything if the associated diff doesn't exist.
Ran unit tests.
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Tool: Pyflakes Processed Files: reviewboard/reviews/builtin_fields.py Tool: PEP8 Style Checker Processed Files: reviewboard/reviews/builtin_fields.py