title: How does Selenium Annotation "@FindBy" work when it returns no element?
body: <p>If @FindBy returns no element, do we get error as I saw @FindBy could be used to get 0 to multiple elements.</p>
  
  <p>Scenario:
  @FindBy(id = "btn")
  private WebElement searchButton;  //allows single element to be referenced</p>
  
  <p>Case 1: If we have no elements having id as "btn", then what would be the result?
  Case 2: If we have multiple elements having id as "btn",then  what would be the result?</p>
  
  <p>Please clarify.</p>