FIX (#1575): Material editor crashes on closing
FIX (#1575): Material editor crashes on closing

mitk::VtkPropRenderer became dependent on DataStorage during fixing bug 1575.
This commit adapts the test cases and makes them create a DataStorage before
testing VtkPropRenderer.




NifTK/MITK,nocnokneo/MITK,MITK/MITK,fmilano/mitk,iwegner/MITK,lsanzdiaz/MITK-BiiG,danielknorr/MITK,danielknorr/MITK,MITK/MITK,NifTK/MITK,RabadanLab/MITKats,rfloca/MITK,MITK/MITK,RabadanLab/MITKats,lsanzdiaz/MITK-BiiG,lsanzdiaz/MITK-BiiG,RabadanLab/MITKats,danielknorr/MITK,MITK/MITK,lsanzdiaz/MITK-BiiG,danielknorr/MITK,nocnokneo/MITK,RabadanLab/MITKats,rfloca/MITK,MITK/MITK,iwegner/MITK,fmilano/mitk,fmilano/mitk,rfloca/MITK,NifTK/MITK,RabadanLab/MITKats,iwegner/MITK,rfloca/MITK,iwegner/MITK,NifTK/MITK,rfloca/MITK,nocnokneo/MITK,lsanzdiaz/MITK-BiiG,danielknorr/MITK,nocnokneo/MITK,lsanzdiaz/MITK-BiiG,lsanzdiaz/MITK-BiiG,rfloca/MITK,MITK/MITK,fmilano/mitk,nocnokneo/MITK,danielknorr/MITK,nocnokneo/MITK,danielknorr/MITK,RabadanLab/MITKats,fmilano/mitk,fmilano/mitk,nocnokneo/MITK,iwegner/MITK,rfloca/MITK,NifTK/MITK,fmilano/mitk,lsanzdiaz/MITK-BiiG,NifTK/MITK,iwegner/MITK