Don't render empty html about books

bookwyrm/templates/book/book_identifiers.html

@@ -1,6 +1,7 @@
 {% spaceless %}
 {% load i18n %}
 
+{% if book.isbn13 or book.oclc_number or book.asin %}
 <dl>
     {% if book.isbn_13 %}
         <div class="is-flex">
@@ -23,4 +24,5 @@
         </div>
     {% endif %}
 </dl>
+{% endif %}
 {% endspaceless %}

bookwyrm/templates/book/publisher_info.html

@@ -3,15 +3,12 @@
 {% load i18n %}
 {% load humanize %}
 
-<p>
 {% firstof book.physical_format_detail book.physical_format as format %}
 {% firstof book.physical_format book.physical_format_detail as format_property %}
 {% with pages=book.pages %}
-        {% if format %}
-            {% comment %}
-                @todo The bookFormat property is limited to a list of values whereas the book edition is free text.
-                @see https://schema.org/bookFormat
-            {% endcomment %}
+{% if format or pages %}
+<p>
+    {% if format_property %}
         <meta itemprop="bookFormat" content="{{ format_property }}">
     {% endif %}
 
@@ -26,8 +23,9 @@
     {% elif pages %}
         {% blocktrans %}{{ pages }} pages{% endblocktrans %}
     {% endif %}
-    {% endwith %}
 </p>
+{% endif %}
+{% endwith %}
 
 {% if book.languages %}
     {% for language in book.languages %}
@@ -41,8 +39,9 @@
     </p>
 {% endif %}
 
-<p>
 {% with date=book.published_date|naturalday publisher=book.publishers|join:', ' %}
+{% if date or book.first_published_date or book.publishers %}
+<p>
     {% if date or book.first_published_date %}
         <meta
             itemprop="datePublished"
@@ -67,6 +66,7 @@
     {% elif publisher %}
         {% blocktrans %}Published by {{ publisher }}.{% endblocktrans %}
     {% endif %}
-    {% endwith %}
 </p>
+{% endif %}
+{% endwith %}
 {% endspaceless %}