Removed the code that removes the helper object property observers from the nodes.
Removed the code that removes the helper object property observers from the nodes.

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