Problem/Motivation
Follow-up of #2613924: Link text isn't marked as required
When the user creates a link field with URI not required and Link text required it is expected to make the URI required in case the user inputs the Link text.
Actual
User inputs only the Link text at the node edit form and saves the node.
The node node is saved without the link data.
Expected
Require the link URI in case the user inputs the Link text
Proposed resolution
Make URI required if there is Link text input.