Cleaning Richtextfield with invalid uuid results in 4 stacktraces.

Steps to reproduce:

1. Log into HAP
2. Edit xmas document
3. Add an internal link to the introduction
4. Go to source
5. Change uuid to 'nonsense'
6. Click source again
7. Note 4 stacktraces are added in the console:

<code>Failed to create facet for node with id nonsense</code>