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Fix analysis crash

Christian Bierlich requested to merge fix-analysis-crash into release-3-1-x

Fixing crashes of two analyses ALICE_2012_I1127497 and ALICE_2012_I930312.

ALICE_2012_I1127497: Did not really crash, but had undefined behaviour if a HepMC heavy ion container was not attached to the event. I have added a more verbose warning message in that case, and veto the event.

ALICE_2012_I930312: Did not comply with the new 'no active histograms in init()' paradigm in Rivet 3. I fixed it by setting titles from a custom constructed string, rather than asking histograms what their names are.

@agbuckley - this fixes issue #85 (closed) @pkarczma - please have a look, and check if I messed up analysis logic.

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