Blobstore provider can be empty, take that into account when reading from link (#584)

Author: kathap

jobs/cc_deployment_updater/templates/cloud_controller_ng.yml.erb

@@ -171,7 +171,9 @@ resource_pool:
   minimum_size: <%= link("cloud_controller_internal").p("cc.resource_pool.minimum_size") %>
   maximum_size: <%= link("cloud_controller_internal").p("cc.resource_pool.maximum_size") %>
   resource_directory_key: <%= link("cloud_controller_internal").p("cc.resource_pool.resource_directory_key") %>
-  blobstore_provider: <%= link("cloud_controller_internal").p("cc.resource_pool.blobstore_provider") %>
+  <% if (rp_provider = link("cloud_controller_internal").p("cc.resource_pool.blobstore_provider", nil)) %>
+  blobstore_provider: <%= rp_provider %>
+  <% end %>
   connection_config: <%= link("cloud_controller_internal").p("cc.resource_pool.connection_config", {}).to_json %>
   <% link("cloud_controller_internal").if_p("cc.resource_pool.cdn") do %>
   cdn:
@@ -195,7 +197,9 @@ packages:
     ca_cert_path: "/var/vcap/jobs/cc_deployment_updater/config/certs/packages_ca_cert.pem"
     <% end %>
   app_package_directory_key: <%= link("cloud_controller_internal").p("cc.packages.app_package_directory_key") %>
-  blobstore_provider: <%= link("cloud_controller_internal").p("cc.packages.blobstore_provider") %>
+  <% if (pk_provider = link("cloud_controller_internal").p("cc.packages.blobstore_provider", nil)) %>
+  blobstore_provider: <%= pk_provider %>
+  <% end %>
   connection_config: <%= link("cloud_controller_internal").p("cc.packages.connection_config", {}).to_json %>
   max_package_size: <%= link("cloud_controller_internal").p("cc.packages.max_package_size") %>
   <% link("cloud_controller_internal").if_p("cc.packages.cdn") do %>
@@ -221,7 +225,9 @@ droplets:
     ca_cert_path: "/var/vcap/jobs/cc_deployment_updater/config/certs/droplets_ca_cert.pem"
     <% end %>
   droplet_directory_key: <%= link("cloud_controller_internal").p("cc.droplets.droplet_directory_key") %>
-  blobstore_provider: <%= link("cloud_controller_internal").p("cc.droplets.blobstore_provider") %>
+  <% if (dp_provider = link("cloud_controller_internal").p("cc.droplets.blobstore_provider", nil)) %>
+  blobstore_provider: <%= dp_provider %>
+  <% end %>
   connection_config: <%= link("cloud_controller_internal").p("cc.droplets.connection_config", {}).to_json %>
   <% link("cloud_controller_internal").if_p("cc.droplets.cdn") do %>
   cdn:
@@ -245,7 +251,9 @@ buildpacks:
     ca_cert_path: "/var/vcap/jobs/cc_deployment_updater/config/certs/buildpacks_ca_cert.pem"
     <% end %>
   buildpack_directory_key: <%= link("cloud_controller_internal").p("cc.buildpacks.buildpack_directory_key") %>
-  blobstore_provider: <%= link("cloud_controller_internal").p("cc.buildpacks.blobstore_provider") %>
+  <% if (bp_provider = link("cloud_controller_internal").p("cc.buildpacks.blobstore_provider", nil)) %>
+  blobstore_provider: <%= bp_provider %>
+  <% end %>
   connection_config: <%= link("cloud_controller_internal").p("cc.buildpacks.connection_config", {}).to_json %>
   <% link("cloud_controller_internal").if_p("cc.buildpacks.cdn") do %>
   cdn: