Generated URL starts with "/" for @Route("") with a parameter

[Legioth]

The return value of Router.getUrl starts with / for @Route("") with a parameter. This causes UI.navigateTo to explode.

The exception is:

java.lang.IllegalArgumentException: Relative path cannot start with /
	at com.vaadin.router.Location.verifyRelativePath(Location.java:314) ~[flow-server-1.0-SNAPSHOT.jar:na]
	at com.vaadin.router.Location.parsePath(Location.java:276) ~[flow-server-1.0-SNAPSHOT.jar:na]
	at com.vaadin.router.Location.<init>(Location.java:71) ~[flow-server-1.0-SNAPSHOT.jar:na]
	at com.vaadin.ui.UI.navigateTo(UI.java:689) ~[flow-server-1.0-SNAPSHOT.jar:na]
	at com.vaadin.ui.UI.navigateTo(UI.java:659) ~[flow-server-1.0-SNAPSHOT.jar:na]