Properties transformation behavior needs further explanation

[tbitonti]

Ref:

/org.eclipse.transformer/src/main/java/org/eclipse/transformer/TransformProperties.java

				// TODO: We might want to skip an update in a specific
				//       case.  A blank/empty update might be used to
				//       encode this.
				if ( nameBuilder.length() != 0 ) {
					throw new IllegalArgumentException("Package version syntax error: Version missing for package [ " + newPackageName + " ] and attribute [ " + nameBuilder.toString() + " ]");