Refactor config abort message a bit for dbconsole

Remove not used variable.
Remove config attr_reader causing warning.
Fix indent in runner file.

railties/lib/rails/commands/dbconsole.rb

@@ -5,7 +5,7 @@ require 'rbconfig'
 
 module Rails
   class DBConsole
-    attr_reader :config, :arguments
+    attr_reader :arguments
 
     def self.start
       new.start
@@ -82,17 +82,13 @@ module Rails
     def config
       @config ||= begin
         cfg = begin
-          cfg = YAML.load(ERB.new(IO.read("config/database.yml")).result)
+          YAML.load(ERB.new(IO.read("config/database.yml")).result)
         rescue SyntaxError, StandardError
           require APP_PATH
           Rails.application.config.database_configuration
         end
 
-        unless cfg[environment]
-          abort "No database is configured for the environment '#{environment}'"
-        end
-
-        cfg[environment]
+        cfg[environment] || abort("No database is configured for the environment '#{environment}'")
       end
     end
 

railties/lib/rails/commands/runner.rb

@@ -41,7 +41,7 @@ ENV["RAILS_ENV"] = options[:environment]
 
 require APP_PATH
 Rails.application.require_environment!
- Rails.application.load_runner
+Rails.application.load_runner
 
 if code_or_file.nil?
   $stderr.puts "Run '#{$0} -h' for help."