Editor / Add support for conditional default view

[fxprunayre]

When creating an editor configuration with more than one default view an exception is returned.

Error on line 82 of edit.xsl:
  XPTY0004: A sequence of more than one item is not allowed as the second argument of concat()

Instead, select the first default view defined.

Also add support for conditionally defined default views:

    <view name="default-for-dataset"
          default="true"
          displayIfRecord="count(//dcat:Catalog/dcat:dataset) > 0">
      <tab id="Dataset" default="true">
        <section name="Dataset info"/>
      </tab>
    </view>
    <view name="default-for-service"
          default="true"
          displayIfRecord="count(//dcat:Catalog/dcat:service) > 0">
      <tab id="Service" default="true">
        <section name="Service info"/>
      </tab>
    </view>

Checklist

• I have read the contribution guidelines
• Pull request provided for main branch, backports managed with label
• Good housekeeping of code, cleaning up comments, tests, and documentation
• Clean commit history broken into understandable chucks, avoiding big commits with hundreds of files, cautious of reformatting and whitespace changes
• Clean commit messages, longer verbose messages are encouraged
• API Changes are identified in commit messages
• Testing provided for features or enhancements using automatic tests
• User documentation provided for new features or enhancements in manual
• Build documentation provided for development instructions in README.md files
• Library management using pom.xml dependency management. Update build documentation with intended library use and library tutorials or documentation

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[joachimnielandt]

Tested locally with two views defined as default=true, editor loads fine.