core: Show error message if _key dynamically passed into error [GH-2328]

CHANGELOG.md

@@ -1,6 +1,9 @@
 ## 1.3.5 (unreleased)
 
+BUG FIXES:
 
+  - core: Fix some places where "no error message" errors were being
+    reported when in fact there were errors. [GH-2328]
 
 ## 1.3.4 (October 2, 2013)
 

lib/vagrant/errors.rb

@@ -60,7 +60,7 @@ module Vagrant
         message = { :_key => message } if message && !message.is_a?(Hash)
         message = { :_key => error_key, :_namespace => error_namespace }.merge(message || {})
 
-        if error_key
+        if message[:_key]
           message = translate_error(message)
         else
           message = error_message

test/unit/vagrant/errors_test.rb

@@ -17,6 +17,14 @@ describe Vagrant::Errors::VagrantError do
     its("status_code") { should eq(1) }
   end
 
+  describe "passing error key through options" do
+    subject { described_class.new(_key: "test_key") }
+
+    it "should use the translation for the message" do
+      subject.to_s.should == "test value"
+    end
+  end
+
   describe "subclass with error message" do
     let(:klass) do
       Class.new(described_class) do