Bug 17256 Exception due to bug 17208
bundles/org.eclipse.core.databinding/src/org/eclipse/core/databinding/conversion/ConvertString2Integer.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.binding.converter.IConverter#convert(java.lang.Object)
	 */
	public Object convert(Object source) {
		String sourceString = (String) source;
		if ("".equals(sourceString.trim())) { 
			return null;
		}
		return super.convert(source);
	}
	public Object getToType() {
		return Integer.class;
	}
}