Related rhbz#928568: Detect aggregators listening at themselves
Related rhbz#928568: Detect aggregators listening at themselves

...which would lead to infinite recursion during disposing.

Change-Id: Ie895dbf8b4497296f2216edeac012f242d720adf

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core