Fix indexing of iso19110 metadata with cardinalities composed of multiple ranges

[josegar74]

The indexing fails for iso19110 metadata with the following error when the cardinality is composed of multiple ranges:

Error at xsl:value-of on line 147 of index.xsl:
  XPTY0004: A sequence of more than one item is not allowed as the first argument of concat()

Test metadata:

https://www.nationaalgeoregister.nl/geonetwork/srv/api/records/8c6a569e-51b3-4328-8725-cfc5e4b21a8d/formatters/xml?approved=true

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