erp5_core: fix KeyError: '..._action' in Module_listWorkflowTransitionItemList

When a workflow transition was not used by any state,
calling some_module.Module_listWorkflowTransitionItemList was raising:
    [..]
      Module script, line 49, in Module_listWorkflowTransitionItemList
       - <PythonScript at /tsxx/Module_listWorkflowTransitionItemList used for /tsxx/some_module>
       - Line 49
        result['listbox_parameter_dict'][transition_id] = [(state_variable, allowed_state_dict[transition_id])]
      Module AccessControl.ZopeGuards, line 83, in guarded_getitem
        v = object[index]
    KeyError: 'some_action'

Now, pick transition among the allowed_state_dict instead of workflow.transitions.

This also fixes mass change state dialog "??? ()" issue.
This commit adds a transition that allows to reproduce that issue.
And this line covers the case :
bt5/erp5_web_renderjs_ui_test/PathTemplateItem/portal_tests/renderjs_ui_zuite/testMassWorkflowTransition.zpt (line 61)

/reviewed-on nexedi/erp5!788

bt5/erp5_ui_test/WorkflowTemplateItem/portal_workflow/foo_workflow/transitions/noop_action.xml

+<?xml version="1.0"?>
+<ZopeData>
+  <record id="1" aka="AAAAAAAAAAE=">
+    <pickle>
+      <global name="TransitionDefinition" module="Products.DCWorkflow.Transitions"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>actbox_category</string> </key>
+            <value> <string>workflow</string> </value>
+        </item>
+        <item>
+            <key> <string>actbox_icon</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>actbox_name</string> </key>
+            <value> <string>Please Do Nothing</string> </value>
+        </item>
+        <item>
+            <key> <string>actbox_url</string> </key>
+            <value> <string>%(content_url)s/Base_viewWorkflowActionDialog?workflow_action=noop_action</string> </value>
+        </item>
+        <item>
+            <key> <string>after_script_name</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>description</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>guard</string> </key>
+            <value>
+              <persistent> <string encoding="base64">AAAAAAAAAAI=</string> </persistent>
+            </value>
+        </item>
+        <item>
+            <key> <string>id</string> </key>
+            <value> <string>noop_action</string> </value>
+        </item>
+        <item>
+            <key> <string>new_state_id</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>script_name</string> </key>
+            <value> <string></string> </value>
+        </item>
+        <item>
+            <key> <string>title</string> </key>
+            <value> <string>Do Nothing</string> </value>
+        </item>
+        <item>
+            <key> <string>trigger_type</string> </key>
+            <value> <int>1</int> </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+  <record id="2" aka="AAAAAAAAAAI=">
+    <pickle>
+      <global name="Guard" module="Products.DCWorkflow.Guard"/>
+    </pickle>
+    <pickle>
+      <dictionary>
+        <item>
+            <key> <string>permissions</string> </key>
+            <value>
+              <tuple>
+                <string>Modify portal content</string>
+              </tuple>
+            </value>
+        </item>
+      </dictionary>
+    </pickle>
+  </record>
+</ZopeData>

product/ERP5/bootstrap/erp5_core/SkinTemplateItem/portal_skins/erp5_core/Module_listWorkflowTransitionItemList.py

@@ -36,7 +36,7 @@ for document_portal_type_id in module_portal_type.getTypeAllowedContentTypeList(
             else:
               allowed_state_dict[possible_transition_id] = [state_id]
 
-        for transition_id in workflow.transitions:
+        for transition_id in allowed_state_dict:
           transition = workflow.transitions[transition_id]
           # Only display user action transition with a dialog to show to user
           if (transition.trigger_type == TRIGGER_USER_ACTION) and (transition.actbox_url) and (transition.actbox_name):