[MIG] helpdesk_rma: for Odoo 12.0

Additionally hide button if there is no assigned customer

helpdesk_rma/__manifest__.py

@@ -1,7 +1,7 @@
 {
     'name': 'Helpdesk RMA',
     'summary': 'Adds RMA functionality to the Helpdesk App',
-    'version': '11.0.1.0.0',
+    'version': '12.0.1.0.0',
     'author': "Hibou Corp.",
     'category': 'Helpdesk',
     'license': 'AGPL-3',

helpdesk_rma/views/helpdesk_views.xml

@@ -10,6 +10,7 @@
             <xpath expr="//button[@name='toggle_active']" position="before">
                 <button class="oe_stat_button" type="object" name="action_partner_rma"
                         context="{'search_default_partner_id': partner_id}"
+                        attrs="{'invisible': [('partner_id', '=', False)]}"
                         icon="fa-cubes">
                     <field string="RMAs" name="rma_count" widget="statinfo"/>
                 </button>