Throwing XPathException not reported

[dizzzz]

When a java-function throws a XPathException, it is not visible in the UI;
only the log file might give a hint.....

[dizzzz]

work around:

    } catch (XPathException ex) {
        LOG.error(ex.getMessage());
        ex.setLocation(this.line, this.column, this.getSource());
        throw ex;
    }

[wolfgangmm]

Should be fixed by ef16820