harvester not handling gml:TimePosition correctly

[smrgeoinfo]

gml:TimePosition is defined with data type <union memberTypes="gml:CalDate time dateTime anyURI decimal"/> in gml/3.2.1/termporal.xsd. I have data that uses gml:TimePosition to report geologic ages, i.e. a decimal number, which is a valid data type in this union, but when I try to harvest those records there is an error and the record is not harvested. In fact it appears that the harvest process hangs...

here is the error message:

2024-04-04T21:40:29,810 ERROR [geonetwork.domain] - Error parsing ISO DateTimes '160'. Error is: null
java.lang.NullPointerException: null
        at org.fao.geonet.utils.DateUtil.parseISODateTimes(DateUtil.java:149) ~[classes/:?]
        at org.fao.geonet.utils.DateUtil.convertToISOZuluDateTime(DateUtil.java:106) ~[classes/:?]

Here is a snippet from the xml being harvested:

<gex:temporalElement>
      <gex:EX_TemporalExtent>
         <gex:extent>
            <gml:TimePeriod>
               <gml:description>geoTime: Jurassic, Cretaceous</gml:description>
               <gml:begin>
                  <gml:TimeInstant>
                     <gml:name>Base Early Jurassic</gml:name>
                     <gml:timePosition  frame="Ma before present" >160</gml:timePosition>
                  </gml:TimeInstant>
               </gml:begin>
               <gml:end>.... like begin

The processor should not assume that gml:timePosition is an ISODateTime-- it needs to check for a URI or numeric value and allow those.

[fxprunayre]

Probably something to improve around here https://github.com/geonetwork/core-geonetwork/blob/main/web/src/main/webapp/xslt/common/index-utils.xsl#L605-L642
and then display information in the record view
https://github.com/geonetwork/core-geonetwork/blob/main/web-ui/src/main/resources/catalog/views/default/templates/recordView/summary.html#L12-L21

The parsing error during indexing should not be something making the harvester hanging.