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THistSvc: fix memory corruption in deReg(string)

Frank Winklmeierrequested to merge
fwinkl/Gaudi:thistsvc_dereg into master

Deregistering a histogram via its name causes a memory corruption (often resulting in a crash). The problem was that deReg(string) kept checking the histogram list size while the list is actually being deleted in the last call to deReg(TObject*).

Also improved the unit test coverage for this case.

cc @leggett @merrenst

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