Closes #2639: Fix deprecation warning for cards with link title value and no link URL value.

[joeparsons]

Description

Ensures value passed to ltrim() (via Drupal\Core\Path\PathValidator->getUrlIfValid()) is a string (not NULL).

Related issues

Closes #2639

How to test

• Add a card to Cards paragraph a flexible page with a link title but no link URL
• Save page
• View page
• Verify no deprecation warning is generated or logged

Types of changes

Arizona Quickstart (install profile, custom modules, custom theme)

• Patch release changes
  • Bug fix
  • Accessibility, performance, or security improvement
  • Critical institutional link or brand change
  • Adding experimental module
  • Update experimental module
• Minor release changes
  • New feature
  • Breaking or visual change to existing behavior
  • Upgrade experimental module to stable
  • Enable existing module by default or database update
  • Non-critical brand change
  • New internal API or API improvement with backwards compatibility
  • Risky or disruptive cleanup to comply with coding standards
  • High-risk or disruptive change (requires upgrade path, risks regression, etc.)
• Other or unknown
  • Other or unknown

Drupal core

• Patch release changes
  • Security update
  • Patch level release (non-security bug-fix release)
  • Patch removal that's no longer necessary
• Minor release changes
  • Major or minor level update
• Other or unknown
  • Other or unknown

Drupal contrib projects

• Patch release changes
  • Security update
  • Patch or minor level update
  • Add new module
  • Patch removal that's no longer necessary
• Minor release changes
  • Major level update
• Other or unknown
  • Other or unknown

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[bberndt-uaz]

Tested on a 2.7.1 sandbox and reproduced the error that is logged when adding a card which has a Card Link Title with no Card Link URL. Tested in Probo and confirmed that no error is logged in the same situation.