Dropping rows with neither a label nor a value read the data padded to
the widest row, so a dropped row wider than the rest (`,,`) left every
kept row one blank cell wider. The graph then had an extra blank series,
and a right-axis assignment to that index was kept. Each kept row now
keeps its own width. This applies to graph.setData and to a graph
variable's data set.
Choosing a data set gave a graph variable's CSV to the graph without the
two steps graph.setData takes after new data: rows with neither a label
nor a value were kept and drawn as empty slots, and a right-axis series
the new data no longer had stayed assigned, so a series added by a later
row started on the right axis. The data set now goes through the same
steps.
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