code: public JQMListItem removeImage() {
          if (imageElem != null) {
              imageElem.removeFromParent();
              imageElem = null;
          }
          getElement().removeClassName(STYLE_UI_LI_HAS_THUMB);
          return this;
      }
docs: Removes the value of the image element if any. It is safe to call this
  method regardless of if an image has been set or not.