Syndetics: handle variations in reviews XML output

Syndetics: handle variations in reviews XML output

For some reason different Syndetics users get
slightly different results when requesting
an XML-formatted review, so it's necessary to
handle both observed variations:

Here's one variation:

...
<Notes>
    <Fld520 I1="BLANK" I2="BLANK">
    <a>This is a review

And another:
...
<Notes>
    <Fld520 I1="BLANK" I2="BLANK">
        This is a review

This patch fixes a bug where some users the
source of a review but not the review itself.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>