PHOTONS++ crashes in BoostDecayBlob

If hadron decays and YFS are enabled, PHOTONS++ crashes basically right away on current master:

  0x7fc5ed248393  in 'SHERPA::Soft_Photon_Handler::BoostDecayBlob(ATOOLS::Blob*)' (Vec4.H:84 (discriminator 1))
  0x7fc5ed249a86  in 'SHERPA::Soft_Photon_Handler::AddRadiation(ATOOLS::Blob*)' (stl_vector.h:671)
  0x7fc5ed4ad653  in 'SHERPA::Decay_Handler_Base::AttachExtraQED(ATOOLS::Blob*, unsigned long)' (Decay_Handler_Base.C:523)
  0x7fc5ed4b4022  in 'SHERPA::Decay_Handler_Base::FillDecayTree(ATOOLS::Blob*, METOOLS::Spin_Density*)' (Decay_Handler_Base.C:298)