Preventing HIModulator to schedule "NULL" as eventshapekey

Sebastian Tapia Arayarequested to merge
stapiaar/athena:fix_himodulator into 23.0

Fix ATLASRECTS-7740

adding member "m_hasShapeKey" that checks if there is a valid key before initializing HIModulator

tagging @christos and HI conveners @angerami @qhu @mrybar

Merge request reports