Disable publish button if metadata is missing

src/universal-dapp.js

@@ -214,7 +214,9 @@ UniversalDApp.prototype.getCreateInterface = function ($container, contract) {
     $createButton.text('Create')
     $createButton.attr('disabled', 'disabled')
     $createButton.attr('title', 'This contract does not implement all functions and thus cannot be created.')
+  }
 
+  if (contract.metadata.length === 0) {
     $publishButton.attr('disabled', 'disabled')
     $publishButton.attr('title', 'This contract does not implement all functions and thus cannot be published.')
   }