Fixes for low-stock emails

- Include variant stock in test
- Improve email template

InvenTree/part/models.py

@@ -2098,7 +2098,7 @@ class Part(MPTTModel):
         Returns True if the total stock for this part is less than the minimum stock level
         """
         
-        return self.total_stock <= self.minimum_stock
+        return self.get_stock_count() <= self.minimum_stock
 
 
 @receiver(post_save, sender=Part, dispatch_uid='part_post_save_log')

InvenTree/templates/email/low_stock_notification.html

@@ -24,8 +24,8 @@
 
 <tr style="height: 3rem">
     <td style="text-align: center;">{{ part.full_name }}</td>
-    <td style="text-align: center;">{{ part.total_stock }}</td>
+    <td style="text-align: center;">{% decimal part.total_stock %}</td>
-    <td style="text-align: center;">{{ part.available_stock }}</td>
+    <td style="text-align: center;">{% part.available_stock %}</td>
-    <td style="text-align: center;">{{ part.minimum_stock }}</td>
+    <td style="text-align: center;">{% part.minimum_stock %}</td>
 </tr>
 {% endblock %}