FIX: plugins that use models in their initialize section might fail when bootstrapping a new database

lib/plugin/instance.rb

@@ -172,7 +172,13 @@ class Plugin::Instance
     end
 
     initializers.each do |callback|
-      callback.call(self)
+      begin
+        callback.call(self)
+      rescue ActiveRecord::StatementInvalid => e
+        # When running db:migrate for the first time on a new database, plugin initializers might
+        # try to use models. Tolerate it.
+        raise e unless e.message.try(:include?, "PG::UndefinedTable")
+      end
     end
   end