When loading a point set first and then open the Point Set plugin, the point set is selected but the points are not shown in the list. The list only appears when deselecting the point set and selecting it again.

Steps to reproduce:

• Load point set in data manager (e.g. MITK-Data/RenderingTestData/openMeAlone.mps)
• open Point set interaction plugin -> openMeAlone is selected, but no list of points shown in "current Pointset"
• deselect openMeAlone as pointset (cross right of selection)
• select openMeAlone again -> List of points is shown in "current Pointset"