LinkField: Error if linked by path but field expects ID and vice versa, and deleted target should not render field empty

Situation:

• In JCR is linked by path, but field expects by id
• Or vice versa: In JCR is linked by id, but field expects by path
• This can happen when changing the field's config, but still have old content. Migrations, try outs, artefact data etc

Problem:

• In both cases one can not open the dialog at all! => the author can not change it
• In the past one just saw the plain property value.
• In JCR is linked by path, but field expects by id

Caused by: javax.jcr.RepositoryException: Not an absolute path: 5c2c69ec-925f-4aca-9321-a143a4b9b1d2

• In JCR is linked by id, but field expects by path

Caused by: java.lang.IllegalArgumentException: /travel/tour-type
	at org.apache.jackrabbit.core.id.NodeId.<init>(NodeId.java:128) ~[jackrabbit-core-2.20.0.jar:2.20.0]

Solution:

About path vice versa:

• If the stored value can not be resolved, let the dialog open.
• Show the value as it is stored

About the linked node is deleted:

• The field shows empty! This is not good as the author doe snot see what the link was/where it linked to.
• The field should show then the stored value, and maybe communicate that the target node is not resolvable.