Fix malicious squashing of heka:aggregator meta introduced by a null value

Change-Id: Ia39c3be0641556e76721a70a7cf775cf9149d11f
diff --git a/opencontrail/meta/heka.yml b/opencontrail/meta/heka.yml
index d1ccfdb..61cc952 100644
--- a/opencontrail/meta/heka.yml
+++ b/opencontrail/meta/heka.yml
@@ -661,9 +661,9 @@
         process: {{ contrail_process }}
     {%- endfor %}
   {%- endif %}
+  {%- if controller_processes is defined %}
 aggregator:
   alarm_cluster:
-  {%- if controller_processes is defined %}
     contrail_api_endpoint:
       policy: availability_of_members
       alerting: enabled