Bug 44443 [Tasks] Problems View should 'filter' more efficiently
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/FieldSeverity.java
*/
	public String getColumnHeaderText() {
		return ""; 
	}
	/**
	 * @see org.eclipse.ui.views.markerview.IField#getColumnHeaderImage()
	 */
	public Image getColumnHeaderImage() {
		return null;
	}
	/**
	 * @see org.eclipse.ui.views.markerview.IField#getValue(java.lang.Object)
	 */
	public String getValue(Object obj) {
		return ""; 
	}
	/**
	 * @see org.eclipse.ui.views.markerview.IField#getImage(java.lang.Object)
	 */
	public Image getImage(Object obj) {
		if (obj == null || !(obj instanceof IMarker)) {
			return null;
		}
		IMarker marker = (IMarker) obj;
		int severity = marker.getAttribute(IMarker.SEVERITY, -1);
		if (severity == IMarker.SEVERITY_ERROR) {
			return ImageFactory.getImage(IMAGE_ERROR_PATH);
		}
		if (severity == IMarker.SEVERITY_WARNING) {
			return ImageFactory.getImage(IMAGE_WARNING_PATH);