fix bug when no data in peer plotting widget
closes #232 (closed)
Use new attr has_data to help not processing the peer plotting widget if it has no data to avoid the case the ruler or zoommarker haven not been created yet.
Edited by Lan Dam
closes #232 (closed)
Use new attr has_data to help not processing the peer plotting widget if it has no data to avoid the case the ruler or zoommarker haven not been created yet.