JATS template: don't include journal-meta unless 'journal'...

...is set in metadata.

Otherwise we get validation errors.

data/templates/default.jats

@@ -10,6 +10,7 @@ $else$
 <article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="1.0" article-type="other">
 $endif$
 <front>
+$if(journal)$
 <journal-meta>
 $if(journal.publisher-id)$
 <journal-id journal-id-type="publisher-id">$journal.publisher-id$</journal-id>
@@ -41,6 +42,7 @@ $if(journal.publisher-loc)$
 $endif$
 </publisher>
 </journal-meta>
+$endif$
 <article-meta>
 $if(article.publisher-id)$
 <article-id pub-id-type="publisher-id">$article.publisher-id$</article-id>

test/writer.jats

@@ -3,13 +3,6 @@
                   "JATS-journalpublishing1.dtd">
 <article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" dtd-version="1.0" article-type="other">
 <front>
-<journal-meta>
-<journal-title-group>
-</journal-title-group>
-<publisher>
-<publisher-name></publisher-name>
-</publisher>
-</journal-meta>
 <article-meta>
 <title-group>
 <article-title>Pandoc Test Suite</article-title>