Fix rendered AST for hunks that only contain a blank newline on additions or deletions #256
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Codex managed to find a case where the renderer would crash on specific change types and we managed to narrow it down to a case where the newLines or oldLines for a change only had a singular newLine, which would get inadvertently removed from the rendered AST and then break rendering.
Also added a test for it to ensure we don't regress this functionality in the future.