Selenium Web Driver condition used to wait until some specific or non-empty text Is present in an element

ExpectedTextIsPresent.java

import org.openqa.selenium.By;
import org.openqa.selenium.StaleElementReferenceException;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.support.ui.ExpectedCondition;


/**
 * Implementation of ExpectedCondition that waits until some specific text is present
 * in the specified element 
 * If the expected text is null, this will wait until there is any non-empty text in the element.
 * If expected text is not null, this will wait until the text of the element exactly matches the expected text
 * @author cliff.darling
 *
 */
public class ExpectedTextIsPresent implements ExpectedCondition<Boolean> {

	private By locator;
	private String expectedText;
	
	/**
	 * @param locator the locator to find the element where the expected text will be compared to
	 * @param expectedText the text to wait for.  If null, will wait for any non-empty text
	 */
	public ExpectedTextIsPresent (By locator, String expectedText){
		this.locator = locator;
		this.expectedText = expectedText;
	}
	
	/**
	 * {@inheritDoc}
	 * @see com.google.common.base.Function#apply(java.lang.Object)
	 */
	public Boolean apply(WebDriver input) {
		try {
			String elementText = input.findElement(locator).getText();
			return elementText!=null && 
				(!"".equals(elementText.trim()) || expectedText.equals(elementText.trim()));
		} catch (StaleElementReferenceException e) {
			return null;
		}
	}

}

Can't expectedText be null here then?