Fix insolvency proceeding install

This was failing [coding style test](https://nexedijs.erp5.net/#/test_result_module/20200305-AB828AA2/54)

/reviewed-on nexedi/erp5!1070

bt5/erp5_insolvency_proceeding/PortalTypeTemplateItem/portal_types/Claim%20Declaration%20Line.xml

@@ -40,7 +40,7 @@
         </item>
         <item>
             <key> <string>init_script</string> </key>
-            <value> <string>ClaimDeclarationLine_init</string> </value>
+            <value> <string></string> </value>
         </item>
         <item>
             <key> <string>permission</string> </key>

bt5/erp5_insolvency_proceeding/PropertySheetTemplateItem/portal_property_sheets/InsolvencyProceeding.xml

@@ -13,11 +13,17 @@
             </value>
         </item>
         <item>
-            <key> <string>_tree</string> </key>
+            <key> <string>_mt_index</string> </key>
             <value>
               <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
             </value>
         </item>
+        <item>
+            <key> <string>_tree</string> </key>
+            <value>
+              <persistent> <string encoding="base64">AAAAAAAAAAQ=</string> </persistent>
+            </value>
+        </item>
         <item>
             <key> <string>description</string> </key>
             <value>
@@ -49,4 +55,12 @@
       <none/>
     </pickle>
   </record>
+  <record id="4" aka="AAAAAAAAAAQ=">
+    <pickle>
+      <global name="OOBTree" module="BTrees.OOBTree"/>
+    </pickle>
+    <pickle>
+      <none/>
+    </pickle>
+  </record>
 </ZopeData>