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Exception thrown in VisualDiff
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Description

Fairly complex edit diff involving moving a heading out of a table.

https://www.mediawiki.org/w/index.php?title=Wikimedia_Audiences/2018-19_Q2_Goals&type=revision&diff=2899548&oldid=2897284&diffmode=visual

Cannot read property 'node' of undefined TypeError: Cannot read property 'node' of undefined
    at VeUiDiffElement.highlightRemovedNode (<anonymous>:278:9)
    at VeUiDiffElement.ve.ui.DiffElement.getChangedTreeNodeData (<anonymous>:280:495)
    at VeUiDiffElement.ve.ui.DiffElement.getChangedNodeData (<anonymous>:272:477)
    at VeUiDiffElement.ve.ui.DiffElement.getChangedNodeElements (<anonymous>:272:102)
    at VeUiDiffElement.processQueue (<anonymous>:266:278)
    at VeUiDiffElement.ve.ui.DiffElement.renderDiff (<anonymous>:269:368)
    at new VeUiDiffElement (<anonymous>:262:822)