Use active pane to save untitled file

Fixes: #143

Author: sadick254

lib/whitespace.js

@@ -25,17 +25,18 @@ module.exports = class Whitespace {
 
         if (editor) {
           this.ignore = true
-          await editor.save()
+          editor.getPath() ? await editor.save() : atom.workspace.getCenter().getActivePane().saveActiveItemAs()
           this.ignore = false
         }
       },
 
-      'whitespace:save-without-trailing-whitespace': () => {
+      'whitespace:save-without-trailing-whitespace': async () => {
         let editor = atom.workspace.getActiveTextEditor()
 
         if (editor) {
           this.removeTrailingWhitespace(editor, editor.getGrammar().scopeName)
-          editor.save()
+          console.log(editor.getPath())
+          editor.getPath() ? await editor.save() : atom.workspace.getCenter().getActivePane().saveActiveItemAs()
         }
       },