bugfix: fix error, where the winrm default path is not set properly by default

lib/vulcano/backend.rb

@@ -33,6 +33,9 @@ module Vulcano
         conf['path']     ||= uri.path
       end
 
+      # ensure path is nil, if its empty; e.g. required to reset defaults for winrm
+      conf['path'] = nil if !conf['path'].nil? && conf['path'].to_s.empty?
+
       # return the updated config
       conf
     end

test/unit/backend_test.rb

@@ -43,6 +43,20 @@ describe 'Vulcano::Backend' do
       res.must_equal org
     end
 
+    it 'resolves a winrm target' do
+      org = {
+        'target' => 'winrm://Administrator@192.168.10.140',
+        'backend' => 'winrm',
+        'host' => '192.168.10.140',
+        'user' => 'Administrator',
+        'password' => nil,
+        'port' => nil,
+        'path' => nil
+      }
+      res = Vulcano::Backend.target_config(org)
+      res.must_equal org
+    end
+
     it 'keeps the configuration when incorrect target is supplied' do
       org = {
         'target' => 'wrong',