flatmap.clearMakers() not working in 2.7.2

[Tehsurfer]

can reproduce this by loading up a flatmap, adding enough markers that they cluster, and then trying to remove them ie:

      component.mapImp.addMarker('UBERON:0016508')
      component.mapImp.addMarker('ILX:0793082')
      component.mapImp.addMarker('ILX:0793082')
      component.mapImp.addMarker('UBERON:0002080')
      component.mapImp.addMarker('ILX:0793082')
      component.mapImp.addMarker('ILX:0793082')
      component.mapImp.addMarker('UBERON:0002080')
      component.mapImp.clearMarkers()

result of the above is this screenshot:

[dbrnz]

Closed with commit 7ee8b73.