toaster: prevent exception when Project.release is null

Project.release can be null. This causes an exception when calling
get_all_compatible_layer_versions(), as the query to fetch
the layer versions references release.branch_name.

Add a guard to the function so that an empty queryset is returned
if the release isn't set for a project.

Signed-off-by: Elliot Smith <elliot.smith@intel.com>
Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/lib/toaster/orm/models.py b/lib/toaster/orm/models.py
index 68c3072991d52c283e7f49a6f1743d22269316a9..f0a8786640baf038789131c5992a048fb29fe187 100644 (file)
--- a/lib/toaster/orm/models.py
+++ b/lib/toaster/orm/models.py
@@ -264,11 +264,17 @@ class Project(models.Model):
     def get_all_compatible_layer_versions(self):
         """ Returns Queryset of all Layer_Versions which are compatible with
         this project"""
-        queryset = Layer_Version.objects.filter(
-            (Q(up_branch__name=self.release.branch_name) &
-             Q(build=None) &
-             Q(project=None)) |
-             Q(project=self))
+        queryset = None
+
+        # guard on release, as it can be null
+        if self.release:
+            queryset = Layer_Version.objects.filter(
+                (Q(up_branch__name=self.release.branch_name) &
+                 Q(build=None) &
+                 Q(project=None)) |
+                 Q(project=self))
+        else:
+            queryset = Layer_Version.objects.none()
 
         return queryset