metadatahook: Use coalesce to handle null values

This uses the coalesce function to take null values into account, else
these resources will fail validation.

Change-Id: Iaf4218dd731826f80b76ff8f7a902adc8c865be5
Closes-Bug: #1681332

1 files changed, 3 insertions, 3 deletions

diff --git a/extraconfig/nova_metadata/krb-service-principals.yaml b/extraconfig/nova_metadata/krb-service-principals.yaml
index c66e6460..56d3cbc0 100644
--- a/extraconfig/nova_metadata/krb-service-principals.yaml
+++ b/extraconfig/nova_metadata/krb-service-principals.yaml
@@ -46,7 +46,7 @@ resources:
           # Filter null values and values that contain don't contain
           # 'metadata_settings', get the values from that key and get the
           # unique ones.
-          expression: list($.data.where($ != null).where($.containsKey('metadata_settings')).metadata_settings.flatten().distinct())
+          expression: list(coalesce($.data, []).where($ != null).where($.containsKey('metadata_settings')).metadata_settings.flatten().distinct())
           data: {get_param: RoleData}
 
   # Generates entries for nova metadata with the following format:
@@ -57,7 +57,7 @@ resources:
     properties:
       value:
         yaql:
-          expression: let(fqdns => $.data.fqdns) -> dict($.data.metadata.where($ != null and $.type = 'vip').select([concat('managed_service_', $.service, $.network), concat($.service, '/', $fqdns.get($.network))]))
+          expression: let(fqdns => $.data.fqdns) -> dict(coalesce($.data.metadata, []).where($ != null and $.type = 'vip').select([concat('managed_service_', $.service, $.network), concat($.service, '/', $fqdns.get($.network))]))
           data:
             metadata: {get_attr: [IncomingMetadataSettings, value]}
             fqdns:
@@ -72,7 +72,7 @@ resources:
     properties:
       value:
         yaql:
-          expression: dict($.data.where($ != null and $.type = 'node').select([$.service, $.network.replace('_', '')]).groupBy($[0], $[1]))
+          expression: dict(coalesce($.data, []).where($ != null and $.type = 'node').select([$.service, $.network.replace('_', '')]).groupBy($[0], $[1]))
           data: {get_attr: [IncomingMetadataSettings, value]}
 
 outputs: