[MIG] document_page_reference: Migration to 18.0

[FIX]document_page_reference :log warning updated

[FIX]document_page_reference: null value issue fixed

document_page_reference/views/report_document_page.xml

@@ -8,7 +8,7 @@
             <attribute name="t-if">1==0</attribute>
         </xpath>
         <xpath expr="//div[@t-raw='doc.content']" position="after">
-            <div t-raw="doc.get_raw_content()" />
+            <t t-out="doc.get_raw_content()" />
         </xpath>
     </template>
 </odoo>