The conventions will now use the most strict convention first and
work its way back to the less strict one. The new order is

  - views/modulepath/viewname
  - views/modulename/viewname
  - modulepath/viewname
  - modulename/viewname
  - views/viewname
  - viewname

This is a breaking change!

They will not return an empty string if the modulepath is null or
empty. When a convention returns an empty string then the convention
is ignored by the DefaultViewResolver and the next convention is
invoked instead