add None option to mentor request

Author: AllenAnthes

pybot/endpoints/slack/message_templates/commands.py

@@ -62,7 +62,10 @@ def mentor_request_attachments(services, mentors, skillsets):
             'fallback': 'Mentor Request',
             'actions': [{
                 'type': 'select', 'text': 'Specific Mentor', 'name': 'mentor',
-                'options': [{'text': mentor, 'value': mentor} for mentor in mentors]
+                'options': [
+                    {'text': 'None', 'value': 'None'},
+                    *[{'text': mentor, 'value': mentor} for mentor in mentors],
+                ]
             }]
         },
         {

pybot/endpoints/slack/message_templates/mentor_request.py

@@ -73,9 +73,10 @@ def add_skillset(self, skillset: str) -> None:
         self.attachments[AttachmentIndex.SKILLSET]['text'] = '\n'.join(skills)
 
     @property
-    def mentor(self) -> str:
+    def mentor(self) -> Optional[str]:
         attachment = self.attachments[AttachmentIndex.MENTOR]
-        return self.selected_option(attachment)
+        option = self.selected_option(attachment)
+        return None if option == 'None' else option
 
     @mentor.setter
     def mentor(self, new_mentor: str) -> None: