Update codeit.js

Author: benhatsor

lib/codeit.js

@@ -398,6 +398,9 @@ class CodeitElement extends HTMLElement {
       if (!selection.rangeCount) return false;
 
       const text = window.getSelection().toString();
+      
+      if (text === '') return false;
+      
       e.clipboardData.setData('text/plain', text);
 
       cd.deleteCurrentSelection();