title: Dart check if many variable is null
body: <p>Hello im new in dart language, is someone can help me to write this condition better, it works but it's a lot repetitive and i feel theres a better ways to write it :</p>
  <pre><code> if (var1 != null || var2 != null || var3 != null || var4 != null || var5 != null){ ShowMyWidget }
  </code></pre>
  <p>thank you.</p>