Forward Port 7.10 - CMS7-8314 - RichText LinksBehavior - IllegalArgumentException: relPath is not a relative path

Reproducible steps:

• Create a document in CMS UI
• Edit a RichText field
• Add an external link on a text
• Select "Other" in link type and enter something starting with '/' like '/a/b/c' in the link.
• Then, when saving, it throws an exception even if it is saved.
• If you try to open the document, then it doesn't open and it throws an exception like the following:

[INFO] [talledLocalContainer] Caused by: java.lang.IllegalArgumentException: relPath is not a relative path: {} {}a {}b {}c
[INFO] [talledLocalContainer] at org.apache.jackrabbit.spi.commons.name.PathFactoryImpl.create(PathFactoryImpl.java:47)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.NodeImpl.getNodeId(NodeImpl.java:270)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.NodeImpl.resolveRelativeNodePath(NodeImpl.java:223)
[INFO] [talledLocalContainer] at org.apache.jackrabbit.core.NodeImpl.hasNode(NodeImpl.java:2277)
[INFO] [talledLocalContainer] at org.hippoecm.repository.decorating.NodeDecorator.hasNode(NodeDecorator.java:299)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.richtext.view.PreviewLinksBehavior.linkExists(PreviewLinksBehavior.java:127)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.richtext.view.PreviewLinksBehavior.internalLink(PreviewLinksBehavior.java:106)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.richtext.RichTextProcessor.decorateTagAttributes(RichTextProcessor.java:246)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.richtext.RichTextProcessor.decorateLinkAttributes(RichTextProcessor.java:207)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.richtext.RichTextProcessor.decorateLinkHrefs(RichTextProcessor.java:203)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.richtext.model.BrowsableModel.getObject(BrowsableModel.java:40)
[INFO] [talledLocalContainer] at org.hippoecm.frontend.plugins.richtext.model.BrowsableModel.getObject(BrowsableModel.java:25)
[INFO] [talledLocalContainer] at org.apache.wicket.Component.getDefaultModelObject(Component.java:1627)
[INFO] [talledLocalContainer] ... 209 more