Enable empty properties

[vinov]

It is possible in Java Webstart to define property with empty value and somehow it ends up in system properties as empty string. Sometimes, application can relly on such properties, but update4j doesn't allow them with IllegalArgumentException: Value must not be empty.

Could update4j convert null property value to empty string value? And accept this empty value?

[mordechaim]

Rightfully so, this decision is based on an old implementation that has since changed. Will review everything to ensure empty properties don't create any unexpected behaviors (like adding it to every string in implyPlaceholders etc.) and will fix it soon.

[mordechaim]

In fact the property implementation is broken and needs to be fixed. Try using a quote or ampersand as values and watch with horror as the xml parser fails to read it.