Bug 17256 Exception due to bug 17208
bundles/org.eclipse.core.databinding/src/org/eclipse/core/databinding/conversion/ToStringConverter.java
* 
	 */
	public ToStringConverter() {
		this(Object.class);
	}
	/**
	 * @param fromClass
	 */
	public ToStringConverter(Class fromClass) {
		this.fromClass = fromClass;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.binding.converter.IConverter#convert(java.lang.Object)
	 */
	public Object convert(Object source) {
		if (source == null) {
			return ""; 
		}
		return source.toString();
	}
	public Object getFromType() {
		return fromClass;
	}
	public Object getToType() {
		return String.class;
	}
}