Corrected xm output (controlfields > 001 were displayed as datafields). Removed some unnecessary checkings.
Corrected xm output (controlfields > 001 were displayed as datafields).
Removed some unnecessary checkings.

inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter,inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,tiborsimko/invenio-formatter