bean parser fails on empty parameters

[jknack]

Given

public class Person {
  String name;
}

{
   get("/", req -> {
      Person person = req.params(Person.class);
   });
}

A call like:

GET /?name=John&enabled

Results in an error:

org.jooby.Err: Server Error(500): Failed to parse parameters to 'example.Person'
	at org.jooby.internal.MutantImpl.to(MutantImpl.java:98)
	at org.jooby.internal.MutantImpl.to(MutantImpl.java:76)
	at org.jooby.Mutant.to(Mutant.java:307)
	at org.jooby.Request.params(Request.java:716)
	at com.jwt.fh.Fh.lambda$null$3e93b7c$1(Fh.java:122)
	at com.jwt.fh.api.EntryManager.lambda$null$20(EntryManager.java:319)
	at javaslang.control.Try.of(Try.java:37)
	at com.jwt.fh.api.EntryManager.lambda$execute$21(EntryManager.java:319)
	at org.skife.jdbi.v2.tweak.transactions.LocalTransactionHandler.inTransaction(LocalTransactionHandler.java:183)
	at org.skife.jdbi.v2.BasicHandle.inTransaction(BasicHandle.java:330)
	at com.jwt.fh.api.EntryManager.execute(EntryManager.java:319)
	at com.jwt.fh.Fh.lambda$new$24(Fh.java:101)
	at org.jooby.Route$OneArgHandler.handle(Route.java:1755)
	at org.jooby.internal.RouteImpl.handle(RouteImpl.java:113)
	at org.jooby.internal.RouteChain.next(RouteChain.java:70)
	at org.jooby.Route$Chain.next(Route.java:2101)
	at org.jooby.Route$Handler.handle(Route.java:1713)
	at org.jooby.internal.RouteImpl.handle(RouteImpl.java:113)
	at org.jooby.internal.RouteChain.next(RouteChain.java:70)
	at org.jooby.Route$Chain.next(Route.java:2101)
	at org.jooby.Route$Handler.handle(Route.java:1713)
	at org.jooby.internal.RouteImpl.handle(RouteImpl.java:113)
	at org.jooby.internal.RouteChain.next(RouteChain.java:70)
	at org.jooby.Route$Chain.next(Route.java:2101)
	at org.jooby.internal.HttpHandlerImpl.handle(HttpHandlerImpl.java:306)
	at org.jooby.internal.netty.NettyHandler.channelRead0(NettyHandler.java:92)
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:372)
	at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:38)
	at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:363)
	at io.netty.util.concurrent.DefaultEventExecutor.run(DefaultEventExecutor.java:66)
	at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:873)
	at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:144)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException: null
	at org.jooby.internal.parser.bean.BeanPlan.compile(BeanPlan.java:159)
	at org.jooby.internal.parser.bean.BeanPlan.newBean(BeanPlan.java:118)