avoid deleting before a use (bnc#693200)
avoid deleting before a use (bnc#693200)

The call to clearShapes() cleared the list and deleted items, which
was what pShape was pointing to -> crash.
ACK by Cedric.

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