Refactor notification data handler
Refactor notification data handler

This refactor just makes sure that we don't have any duplicate code
where we don't need it.

plamut/ggrc-core,andrei-karalionak/ggrc-core,edofic/ggrc-core,josthkko/ggrc-core,kr41/ggrc-core,plamut/ggrc-core,josthkko/ggrc-core,prasannav7/ggrc-core,prasannav7/ggrc-core,j0gurt/ggrc-core,prasannav7/ggrc-core,plamut/ggrc-core,j0gurt/ggrc-core,kr41/ggrc-core,VinnieJohns/ggrc-core,josthkko/ggrc-core,andrei-karalionak/ggrc-core,j0gurt/ggrc-core,VinnieJohns/ggrc-core,selahssea/ggrc-core,andrei-karalionak/ggrc-core,prasannav7/ggrc-core,edofic/ggrc-core,NejcZupec/ggrc-core,AleksNeStu/ggrc-core,kr41/ggrc-core,AleksNeStu/ggrc-core,selahssea/ggrc-core,kr41/ggrc-core,NejcZupec/ggrc-core,VinnieJohns/ggrc-core,AleksNeStu/ggrc-core,VinnieJohns/ggrc-core,josthkko/ggrc-core,selahssea/ggrc-core,AleksNeStu/ggrc-core,selahssea/ggrc-core,NejcZupec/ggrc-core,edofic/ggrc-core,j0gurt/ggrc-core,edofic/ggrc-core,andrei-karalionak/ggrc-core,NejcZupec/ggrc-core,plamut/ggrc-core