avoid deadlock in 3D charts
avoid deadlock in 3D charts

taking the mutex before calling join is silly

Change-Id: I5a2df82f748aa7ccd13824369da5c81842285076

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