Enabled jinja2.ChainableUndefined for custom webhook notifications

Signed-off-by: Will Haines <william.haines@colorado.edu>

awx/main/models/notifications.py

@@ -12,7 +12,7 @@ from django.core.mail.message import EmailMessage
 from django.db import connection
 from django.utils.translation import ugettext_lazy as _
 from django.utils.encoding import smart_str, force_text
-from jinja2 import sandbox
+from jinja2 import sandbox, ChainableUndefined
 from jinja2.exceptions import TemplateSyntaxError, UndefinedError, SecurityError
 
 # AWX
@@ -429,7 +429,7 @@ class JobNotificationMixin(object):
         raise RuntimeError("Define me")
 
     def build_notification_message(self, nt, status):
-        env = sandbox.ImmutableSandboxedEnvironment()
+        env = sandbox.ImmutableSandboxedEnvironment(undefined=ChainableUndefined)
 
         from awx.api.serializers import UnifiedJobSerializer
         job_serialization = UnifiedJobSerializer(self).to_representation(self)

requirements/requirements_ansible.in

@@ -43,7 +43,7 @@ azure-mgmt-iothub==0.7.0
 # AWS
 boto==2.47.0    # last which does not break ec2 scripts
 boto3==1.9.223
-jinja2==2.10.1  # required for native jinja2 types for inventory compat mode
+jinja2==2.11.2  # required for ChainableUndefined
 # netconf for network modules
 ncclient==0.6.3
 # netaddr filter

requirements/requirements_ansible.txt

@@ -58,7 +58,7 @@ idna==2.8                 # via requests
 ipaddress==1.0.23; python_version < "3" # via cryptography, kubernetes, openstacksdk
 iso8601==0.1.12           # via keystoneauth1, openstacksdk
 isodate==0.6.0            # via msrest
-jinja2==2.10.1            # via -r /awx_devel/requirements/requirements_ansible.in, openshift
+jinja2==2.11.2            # via -r /awx_devel/requirements/requirements_ansible.in, openshift
 jmespath==0.9.4           # via azure-cli-core, boto3, botocore, knack, openstacksdk
 jsonpatch==1.24           # via openstacksdk
 jsonpointer==2.0          # via jsonpatch