[Selenium]对于某些对话框即有可能弹出来，也有可能不弹出来，这种应该怎么处理呢？

界面上如果有一个对话框可能弹出来，也可能不弹出，我们都要认为是正常，应该怎么处理呢？

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/**      * check if release notes dialog present      * @author j      */     public boolean isReleaseNotesDialogPresent(){         try{             new WebDriverWait(driver, 30).until(ExpectedConditions.presenceOfElementLocated(By.cssSelector("div#releaseNotes")));             return true;         }         catch(Exception e){             logger.info("There's no release notes dialog pop up");             return false;         }     }           /**      * check if release notes dialog present,if yes,close release notes dialog by click close button      * @author j      */     public void closeReleaseNotesDialog(){         boolean isDialogPresent=isReleaseNotesDialogPresent();         if(isDialogPresent==true){             SeleniumUtil.waitForElementPresent(driver, By.cssSelector("input#btnClose")).click();         }     }