title: Inform user of invalid input in Dash
body: <p>I have created a dashboard using dash. It has an input box in which the user enters some data. If the data is found in the attached dataframe then a few graphs are shown. But if the input the user entered is not found in the dataframe then nothing happens and the page stays blank. Is there a way to show an error message as so if the input is invalid:</p>
  <p><a href="https://i.stack.imgur.com/Z3uy8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Z3uy8.png" alt="enter image description here" /></a></p>