From a8b57ba13fc8ba4579e10f708887c57a071b160f Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Fri, 18 Jan 2013 12:27:29 -0800
Subject: [PATCH] Ignore empty error groups

---
 lib/vagrant/config/v2/root.rb            |  6 ++++--
 test/unit/vagrant/config/v2/root_test.rb | 11 +++++++++++
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/lib/vagrant/config/v2/root.rb b/lib/vagrant/config/v2/root.rb
index 9b8cbf1f4..b2a6bf4f0 100644
--- a/lib/vagrant/config/v2/root.rb
+++ b/lib/vagrant/config/v2/root.rb
@@ -55,8 +55,10 @@ module Vagrant
               result = instance.validate(env)
               if result && !result.empty?
                 result.each do |key, value|
-                  errors[key] ||= []
-                  errors[key] += value
+                  if !value.empty?
+                    errors[key] ||= []
+                    errors[key] += value
+                  end
                 end
               end
             end
diff --git a/test/unit/vagrant/config/v2/root_test.rb b/test/unit/vagrant/config/v2/root_test.rb
index 10b5228a0..a705153ba 100644
--- a/test/unit/vagrant/config/v2/root_test.rb
+++ b/test/unit/vagrant/config/v2/root_test.rb
@@ -73,5 +73,16 @@ describe Vagrant::Config::V2::Root do
 
       instance.validate(env).should == expected_errors
     end
+
+    it "shouldn't count empty keys" do
+      errors = { "foo" => [] }
+      env    = { "errors" => errors }
+      foo    = instance.foo
+      def foo.validate(env)
+        env["errors"]
+      end
+
+      instance.validate(env).should == {}
+    end
   end
 end