[Toaster] [PATCH 2/4] toaster: prevent exception when Project.release is null

[Elliot Smith]

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 at intel.com>
---
 bitbake/lib/toaster/orm/models.py | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/bitbake/lib/toaster/orm/models.py b/bitbake/lib/toaster/orm/models.py
index 68c3072..f0a8786 100644
--- a/bitbake/lib/toaster/orm/models.py
+++ b/bitbake/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
 
-- 
1.9.3

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