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remove "sys" from legend if sys failed

Frank Sauerburger requested to merge HWWATLAS-174 into master

Implements the proposed behavior for systematic error bands:

  1. Try to retrieve the histogram of a systematic variation
  2. If this fails, WARN the user and try to get yield-only systematic variation
  3. If this fails, issue an ERROR message and scale systematic error band to 0
  4. Write "sys + stat" in the legend if and only if one of the above methods worked

See https://its.cern.ch/jira/projects/HWWATLAS/issues/HWWATLAS-174

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