Prevent to create blank comment

Currently blank comment does not dump to `db/schema.rb`. But created it
even if specified blank.

1 files changed, 5 insertions, 3 deletions

diff --git a/activerecord/lib/active_record/schema_dumper.rb b/activerecord/lib/active_record/schema_dumper.rb
index ab2d64e903..41fed004a0 100644
--- a/activerecord/lib/active_record/schema_dumper.rb
+++ b/activerecord/lib/active_record/schema_dumper.rb
@@ -128,9 +128,7 @@ HEADER
 
           table_options = @connection.table_options(table)
           if table_options.present?
-            table_options.each do |key, value|
-              tbl.print ", #{key}: #{value.inspect}" if value.present?
-            end
+            tbl.print ", #{format_options(table_options)}"
           end
 
           tbl.puts " do |t|"
@@ -237,6 +235,10 @@ HEADER
         end
       end
 
+      def format_options(options)
+        options.map { |key, value| "#{key}: #{value.inspect}" if value }.compact.join(", ")
+      end
+
       def remove_prefix_and_suffix(table)
         table.gsub(/^(#{@options[:table_name_prefix]})(.+)(#{@options[:table_name_suffix]})$/,  "\\2")
       end