AnalysisBase fixes for TrigBtagEmulationTool

Teng Jian Khoorequested to merge
khoo/athena:21.2-TrigBtagEmulationTool-ABFixes into 21.2

Protections against:

  • failing to find a jet matched to the b-tag
  • attempting to retrieve tracks when we don't want to run retagging

FYI @cvarni

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