title: How to avoid Null or empty value in Lineedit of Pyqt5
body: <p>I have created a form using PyQT5 using python, in the form I getting value from user through QLineEdit.</p>
  
  <p>My problem is that user should not leave any of the field empty in the form.</p>
  
  <p>How to avoid empty Lineedit? </p>