Separate upstream member collection into separate module to kill storeconfig warn

manifests/resource/upstream.pp

@@ -97,8 +97,10 @@ define nginx::resource::upstream (
       content => template('nginx/conf.d/upstream_members.erb'),
     }
   } else {
-    # Collect exported members:
-    ::Nginx::Resource::Upstream::Member <<| upstream == $name |>>
+    class { 'nginx::resource::upstream::collect':
+      # Collect exported members
+      upstream_name => $name,
+    }
   }
 
   concat::fragment { "${name}_upstream_footer":

manifests/resource/upstream/collect.pp

@@ -0,0 +1,12 @@
+# Class to collect exported upstream members, if needed.
+#
+# This is separated into a separate class in order to remove errors if
+# storeconfigs are unavailable.
+
+class nginx::resource::upstream::collect (
+  $upstream_name,
+)
+{
+  # Collect exported members:
+  ::Nginx::Resource::Upstream::Member <<| upstream == $upstream_name |>>
+}