Merge pull request #12672 from atom/ns-close-spec-windows-immediately

Don't wait for spec windows to save state

src/main-process/atom-window.coffee

@@ -178,6 +178,9 @@ class AtomWindow
     @unloading = false
 
   saveState: ->
+    if @isSpecWindow()
+      return Promise.resolve()
+
     @lastSaveStatePromise = new Promise (resolve) =>
       callback = (event) =>
         if BrowserWindow.fromWebContents(event.sender) is @browserWindow