HasErrorParameter / setParameter behavior change

[OlliTietavainenVaadin]

Issue came up in training:

• If a MyException inheriting RuntimeException is thrown in the setParameter method and there is an error view implementing a matching HasErrorParameter, 10.0.0beta1 and 10.0.0beta6 behave differently
• beta1 shows the error view
• beta6 shows

Reason: Failed to parse url parameter, exception: org.vaadin.olli.MyException

Available routes:
<root> (requires parameter)
This detailed message is only shown when running in development mode.

• Example project: test with 10.0.0beta1 and 10.0.0beta6
  my_starter_project.zip

Not sure if this is an intended change or not, but I think I prefer the error view being shown