set state var default to present

playbooks/edx-east/create_db_and_users.yml

@@ -67,7 +67,7 @@
     - name: create mysql users and assign privileges
       mysql_user:
         name: "{{ item.name }}"
-        state: "{{ item.state }}"
+        state: "{{ item.state | default('present') }}"
         priv: "{{ '/'.join(item.privileges) }}"
         password: "{{ item.password }}"
         host: "{{ item.host }}"