Steps to reproduce

1. Create a new page with Basic Template
2. Create HTML component and insert UTF-16 symbol (e.g. this one)
3. Try to publish the page

Actual behavior

1. Publisher can only see very common message

   Publishing failed, please contact your system administrator to help you resolve the issue.
   

2. Log message on public instance gives no additional information

Expected behavior

1. Log message shows the exception root cause smth like

   javax.jcr.InvalidSerializedDataException: XML parse error
   ...
   Caused by: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 4047; Character reference "&#55357" is an invalid XML character.
   ...
   

Development Notes

1. Exception is "eaten" on this line
2. In the same class in other use-case exception is not eaten, see this line