BVERSION-87 : "Convert to versioned" shouldn't be possible if no version exists

- removing the page actions from book pages

Author: rstavro

application-book-versions-ui/src/main/resources/BookVersions/Code/AdministrationMenu.xml

@@ -529,7 +529,7 @@
             #end
           </ul>
         </dd>
-        #if($services.bookversions.isPage($docRef) || $isVersionedContent)
+        (!$services.bookversions.isBook($docRef) && ($services.bookversions.isPage($docRef) || $isVersionedContent))
         <dt class="dropdown-header">$services.localization.render('BookVersions.adminMenu.pageActions')</dt>
         <dd>
           <ul>