fix(validate): pass validation when there is no validator

it would be hard for user to fix this until there is a ui,
so rather make it pass the validation and log a warning.

SDESK-333

apps/validate/validate.py

@@ -179,4 +179,5 @@ def _validate(self, doc, **kwargs):
                     response.append(message)
             return response
         else:
-            return ['validator was not found for {}'.format(doc['act'])]
+            logger.warn('validator was not found for {}'.format(doc['act']))
+            return []

features/content_publish.feature

@@ -518,7 +518,7 @@ Feature: Content Publishing
       """
 
     @auth
-    Scenario: Publish a user content fails if content format is not compatible
+    Scenario: Publish a user content if content format is not compatible
       Given the "validators"
       """
       [{"_id": "publish_text", "act": "publish", "type": "text", "schema":{}}]
@@ -549,10 +549,7 @@ Feature: Content Publishing
       }
       """
       And we publish "#archive._id#" with "publish" type and "published" state
-      Then we get response code 400
-      """
-      {"_issues": {"validator exception": "500: Failed to publish the item: PublishQueueError Error 9009 - Item could not be queued"}}
-      """
+      Then we get response code 200
 
     @auth
     Scenario: Schedule a user content publish

features/validate.feature

@@ -166,7 +166,7 @@ Feature: Validate
       """
     Then we get existing resource
     """
-    {"errors": ["validator was not found for missing"]}
+    {"errors": []}
     """
 
   @auth