Y Axis undefined (fatal error) if all series on axis are hidden.

[BubbleupHosting]

When instantiating a line graph with multiple series on multiple y-axes, if a particular axis has only series with {show: false} it will die with a fatal error:

jQuery.Deferred exception: yp is undefined $.jqplot.LineRenderer.prototype.setGridData@http://atlas.bubbleupsandbox.ca/jqplot/jquery.jqplot.js:5584:71

This error is slightly different but less helpful when using minified JQPlot.

An axis is undefined if all series assigned to it are set to {show: false} and therefore instead of just hiding the axis or plotting nothing. The undefined value causes a fatal error and JS kicks out without rendering the rest of the lines or applying other plugins that might be enabled.
Here is a simple example of code to reproduce the issue:

let plot1 = jQuery.jqplot( 'chart1', [ [ [1, 578], [2, 566], [3, 480], [4, 509], [5, 454], [6, 379], [7, 303], [8, 308], [9, 299], [10, 346], [11, 325], [12, 386] ], [ [1, 428], [2, 466], [3, 390], [4, 419], [5, 374], [6, 309], [7, 233], [8, 228], [9, 189], [10, 236], [11, 205], [12, 256] ], [ [1, 248], [2, 336], [3, 250], [4, 279], [5, 254], [6, 179], [7, 153], [8, 108], [9, 99], [10, 146], [11, 125], [12, 186] ], [ [1, 678], [2, 666], [3, 580], [4, 609], [5, 564], [6, 469], [7, 503], [8, 438], [9, 389], [10, 466], [11, 475], [12, 456] ], ], { title:'Broken Axes', axes: { xaxis: { label: 'X-Axis', }, yaxis: { label : 'First Y-Axis', }, y2axis: { label : 'Second Y-Axis', }, }, series: [ { show: true, color: 'red', yaxis: 'yaxis', }, { show: false, color: 'blue', yaxis: 'y2axis', }, { show: false, color: 'purple', yaxis: 'y2axis', }, { show: true, color: 'orange', yaxis: 'yaxis', }, ], } );

Also at this JS Fiddle: http://jsfiddle.net/L4juxvd3/3/

When series 2 and 3 (both on y2axis) are both hidden, the final orange series (on yaxis) never gets to render because of the error.

A workaround is to render the graph and then manually hide each series that shouldn't be there and re-plot the graph, but that should not be necessary, especially as {show: false} is a basic property built right into Series which simply breaks whole graphs.

[BubbleupHosting]

Adding {scaleToHiddenSeries: true} to axes which have only hidden series is a workaround, but it means that if series on a single axis have rather different scales (~10 vs ~50) can produce a lot of empty space if only one is shown.