payment_mean: always show listbox in Select Dialog

Show an empty listbox at the beginning, that will be populated when user
start to search.
This is required if we want the ?reset=1 from the action URL to really
reset the selection.

bt5/erp5_payment_mean/SkinTemplateItem/portal_skins/erp5_payment_mean/PaymentTransactionGroup_getGroupablePaymentTransactionLineList.py

 portal = context.getPortalObject()
 
-if mode == 'stopped_or_delivered':
+if mode is None:
+  # To show an empty listbox the first time the dialog is open
+  return []
+elif mode == 'stopped_or_delivered':
   simulation_state = ('delivered', 'stopped')
 else:
   assert mode == 'planned_or_confirmed', "Unknown mode, %r" % mode

bt5/erp5_payment_mean/SkinTemplateItem/portal_skins/erp5_payment_mean/PaymentTransactionGroup_viewSelectPaymentTransactionLineListDialog/listbox.xml

@@ -262,9 +262,7 @@
                 </item>
                 <item>
                     <key> <string>enabled</string> </key>
-                    <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
-                    </value>
+                    <value> <string></string> </value>
                 </item>
                 <item>
                     <key> <string>external_validator</string> </key>
@@ -289,13 +287,13 @@
                 <item>
                     <key> <string>lines</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
                     </value>
                 </item>
                 <item>
                     <key> <string>list_action</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAQ=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAM=</string> </persistent>
                     </value>
                 </item>
                 <item>
@@ -345,7 +343,7 @@
                 <item>
                     <key> <string>selection_name</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAU=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAQ=</string> </persistent>
                     </value>
                 </item>
                 <item>
@@ -543,7 +541,7 @@
                 <item>
                     <key> <string>list_method</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAY=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAU=</string> </persistent>
                     </value>
                 </item>
                 <item>
@@ -624,7 +622,7 @@
                 <item>
                     <key> <string>stat_method</string> </key>
                     <value>
-                      <persistent> <string encoding="base64">AAAAAAAAAAc=</string> </persistent>
+                      <persistent> <string encoding="base64">AAAAAAAAAAY=</string> </persistent>
                     </value>
                 </item>
                 <item>
@@ -656,19 +654,6 @@
     </pickle>
   </record>
   <record id="2" aka="AAAAAAAAAAI=">
-    <pickle>
-      <global name="TALESMethod" module="Products.Formulator.TALESField"/>
-    </pickle>
-    <pickle>
-      <dictionary>
-        <item>
-            <key> <string>_text</string> </key>
-            <value> <string>python:request.form.get(\'sign\')</string> </value>
-        </item>
-      </dictionary>
-    </pickle>
-  </record>
-  <record id="3" aka="AAAAAAAAAAM=">
     <pickle>
       <global name="TALESMethod" module="Products.Formulator.TALESField"/>
     </pickle>
@@ -681,7 +666,7 @@
       </dictionary>
     </pickle>
   </record>
-  <record id="4" aka="AAAAAAAAAAQ=">
+  <record id="3" aka="AAAAAAAAAAM=">
     <pickle>
       <global name="TALESMethod" module="Products.Formulator.TALESField"/>
     </pickle>
@@ -698,7 +683,7 @@ string:Base_viewListMode?proxy_form_id=${form/getId}&proxy_field_id=${field/getI
       </dictionary>
     </pickle>
   </record>
-  <record id="5" aka="AAAAAAAAAAU=">
+  <record id="4" aka="AAAAAAAAAAQ=">
     <pickle>
       <global name="TALESMethod" module="Products.Formulator.TALESField"/>
     </pickle>
@@ -711,7 +696,7 @@ string:Base_viewListMode?proxy_form_id=${form/getId}&proxy_field_id=${field/getI
       </dictionary>
     </pickle>
   </record>
-  <record id="6" aka="AAAAAAAAAAY=">
+  <record id="5" aka="AAAAAAAAAAU=">
     <pickle>
       <global name="Method" module="Products.Formulator.MethodField"/>
     </pickle>
@@ -724,7 +709,7 @@ string:Base_viewListMode?proxy_form_id=${form/getId}&proxy_field_id=${field/getI
       </dictionary>
     </pickle>
   </record>
-  <record id="7" aka="AAAAAAAAAAc=">
+  <record id="6" aka="AAAAAAAAAAY=">
     <pickle>
       <global name="Method" module="Products.Formulator.MethodField"/>
     </pickle>