Provide better error messages in MCRSourceConent

Description

Sometimes you get a blank page or an error page with just this kind of message: Could not get MCRContent from JDOMSource. So you have to guess what might be the real reason why your application is broken.
As it turns out the real source is often an XSL bug in one of the stylesheets. To give a hint we should print out the URI that causes that breakage.

Environment

None

Assignee

Thomas Scheffler

Reporter

Thomas Scheffler

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Fix versions

Affects versions

Priority

Medium
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