remove check on the existence of the decorator in EgammaVariableCorrection
This fixes ATLASEG-317.
The bug was introduced in !60868 (merged) where a special case for the fudging of variable transformed_e_probability_ht
has introduced. We added the decoration for the variable only if m_variableToCorrect->isAvailable(electron)
was false, but actually this is true if another electron has been decorated before.
Also target master and 24.2
Edited by Ruggero Turra