BUGFIX: Improve error for wrong default dsp in routing

[mhsdesign]

Missing the defaultDimensionSpacePoint will just be ignored silently as we then use the default dsp {} which will not find any nodes in a multi language cr.

Neos:
  Neos:
    sites:
      'your-site':
        contentRepository: 'default'
        contentDimensions:
          defaultDimensionSpacePoint: {language: de}
          resolver:
            factoryClassName: Neos\Neos\FrontendRouting\DimensionResolution\Resolver\AutoUriPathResolverFactory

A non helpful error is shown:

Instead we throw a raw exception to raise attention.

Upgrade instructions

Review instructions

Checklist

• Code follows the PSR-2 coding style
• Tests have been created, run and adjusted as needed
• The PR is created against the lowest maintained branch
• Reviewer - PR Title is brief but complete and starts with FEATURE|TASK|BUGFIX
• Reviewer - The first section explains the change briefly for change-logs
• Reviewer - Breaking Changes are marked with !!! and have upgrade-instructions