message: Defensive rendering of manageable blocks
diff: @@ -83,7 +83,7 @@ const PotentiallyEditableBlockCellNonNull = ({
  value: { block: ChannelTableContentsSet_channel_blokks; attr: 'title' }
  }): JSX.Element => {
  const value = block[attr]
  - const editable = block.__typename !== 'Channel' && block.can.manage
  + const editable = block.__typename !== 'Channel' && block?.can?.manage
  const [mode, setMode] = useState<EditableCellMode>(
  editable ? 'editable' : 'resting'
  )
  