Make AutoConfigFlags.GetFileMD method more robust

John Derek Chapmanrequested to merge
jchapman/athena:FixATLASSIM-5234_master into master

Fixing bug where GetFileMD method was passed a str file name and interpreted it as a list of single character file names. Fixed at source and also improved GetFileMD method to behave sensibily in this case. Fixes ATLASSIM-5234

Edited by John Derek Chapman

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