Plot rendering fix when PV disconnects #2189
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In the Stripchart widget using trace type "step", a horizontal line is painted when the associated PV disconnects. Once it connects the available values will be rendered, but the horizontal line in most cases remains, see screen shot.
This defect is not seen when using trace type "line".
This PR is an attempt to fix the issue so that the behavior for "step" is the same as for "line".