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FakeBkgTools: fix initialization failure for one-letter systematics/parameters

Julien Maurer requested to merge jmaurer/athena:b21_2-FakeBkgTools-160322 into 21.2

As reported by @kiabelin (thanks!), this doesn't work as it should:

<syst affects="electron,muon"> DiBoson,W,stop,met,d0sig,ttbar,Z</syst>

due to a bug in the splitting+trimming of the comma-separated values. This affects only parameters with a one-character name, and leads to an initialization failure, so no impact on physics.

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