Fix coding standards (empty blocks)

spec/producer/core/recipe/dsl_spec.rb

@@ -34,7 +34,7 @@ module Producer::Core
     end
 
     describe '#tasks' do
-      let(:code) { proc { task(:some_task) { } } }
+      let(:code) { proc { task(:some_task) {} } }
 
       it 'returns registered tasks' do
         dsl.evaluate

spec/producer/core/task/dsl_spec.rb

@@ -2,7 +2,7 @@ require 'spec_helper'
 
 module Producer::Core
   describe Task::DSL do
-    let(:block)   { proc { } }
+    let(:block)   { proc {} }
     let(:env)     { double 'env' }
     subject(:dsl) { Task::DSL.new(env, &block) }