Properly handle the case that VM doesn't exist for the VB driver.

plugins/providers/virtualbox/provider.rb

@@ -1,11 +1,24 @@
+require "log4r"
+
 module VagrantPlugins
   module ProviderVirtualBox
     class Provider < Vagrant.plugin("1", :provider)
       attr_reader :driver
 
       def initialize(machine)
+        @logger  = Log4r::Logger.new("vagrant::provider::virtualbox")
         @machine = machine
+
+        begin
+          @logger.debug("Instantiating the driver for machine ID: #{@machine.id.inspect}")
           @driver  = Driver::Meta.new(@machine.id)
+        rescue Driver::Meta::VMNotFound
+          # The virtual machine doesn't exist, so we probably have a stale
+          # ID. Just clear the id out of the machine and reload it.
+          @logger.debug("VM not found! Clearing saved machine ID and reloading.")
+          @machine.id = nil
+          retry
+        end
       end
 
       # @see Vagrant::Plugin::V1::Provider#action

test/unit/vagrant/machine_test.rb

@@ -283,6 +283,17 @@ describe Vagrant::Machine do
       instance.id = "foo"
       new_instance.id.should == "foo"
     end
+
+    it "should delete the ID" do
+      instance.id = "foo"
+
+      second = new_instance
+      second.id.should == "foo"
+      second.id = nil
+
+      third = new_instance
+      third.id.should be_nil
+    end
   end
 
   describe "ssh info" do