urwid / urwid / 37019998166

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Keep BarGraph rendering with bad top and values (#1390)

BarGraph and GraphVScale raised from render when top was zero or NaN,
or when a value, hline or label was NaN, infinite or too large for a
float.

- scale_bar_values maps a zero, NaN, infinite or overlarge top to a row
  past the graph for every value, counts NaN as zero and moves
  infinite rows just outside the graph; finite rows are unchanged.
- hlines_display drops hlines that are NaN, infinite or cannot be
  scaled.
- set_data and GraphVScale.set_scale drop NaN positions before sorting,
  so they no longer scramble the order of the others.

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