erp5_hal_json_style: return 404 error if no view was found

Do not return wrong content type

bt5/erp5_hal_json_style/SkinTemplateItem/portal_skins/erp5_hal_json_style/ERP5Document_getHateoas.py

@@ -1449,7 +1449,11 @@ def calculateHateoas(is_portal=None, is_site_root=None, traversed_document=None,
         view_context = traversed_document
       else:
         view_context = traversed_document.restrictedTraverse(current_action['other_context'])
-      view_instance = getattr(view_context, current_action['view_id'])
+
+      view_instance = getattr(view_context, current_action['view_id'], None)
+      if view_instance is None:
+        response.setStatus(404)
+        return ""
       if (view_instance is not None):
         embedded_dict = {
           '_links': {
@@ -2385,7 +2389,6 @@ if mode == 'url_generator':
 
 context.Base_prepareCorsResponse(RESPONSE=response)
 
-response.setHeader('Content-Type', mime_type)
 hateoas = calculateHateoas(relative_url=relative_url,
                            REQUEST=REQUEST, response=response, view=view, mode=mode,
                            query=query, select_list=select_list, limit=limit, form=form,
@@ -2396,4 +2399,5 @@ hateoas = calculateHateoas(relative_url=relative_url,
 if hateoas == "":
   return hateoas
 else:
+  response.setHeader('Content-Type', mime_type)
   return json.dumps(hateoas, indent=2)

bt5/erp5_hal_json_style/TestTemplateItem/portal_components/test.erp5.testHalJsonStyle.py

@@ -708,6 +708,19 @@ class TestERP5Document_getHateoas_mode_traverse(ERP5HALJSONStyleSkinsMixin):
                                                                                      document.getRelativeUrl()))
     self.assertEqual(result_dict['_embedded']['_view']['_actions']['put']['method'], 'POST')
 
+  @simulate('Base_getRequestUrl', '*args, **kwargs',
+      'return "http://example.org/bar"')
+  @simulate('Base_getRequestHeader', '*args, **kwargs',
+            'return "application/hal+json"')
+  @changeSkin('Hal')
+  def test_getHateoasDocument_non_existing_action(self):
+    document = self._makeDocument()
+    fake_request = do_fake_request("GET")
+    result = self.portal.web_site_module.hateoas.ERP5Document_getHateoas(REQUEST=fake_request, mode="traverse", relative_url=document.getRelativeUrl(), view="not_existing_action")
+    self.assertEquals(fake_request.RESPONSE.status, 404)
+    self.assertEquals(fake_request.RESPONSE.getHeader('Content-Type'), None)
+    self.assertEqual(result, "")
+
   @simulate('Base_getRequestUrl', '*args, **kwargs',
       'return "http://example.org/bar"')
   @simulate('Base_getRequestHeader', '*args, **kwargs',