MapProperty requires non empty path

[Sxtanna]

MapProperty does not generate default values when it's path is an empty String.

ex. Bean

class Info {
    String       name;
    List<String> lore;
}

ex. Property

public static final MapProperty<Info> INFO = mapProperty(BeanPropertyType.of(Info.class))
.path("")
.defaultEntry("basic", new Info("hello", Arrays.asList("world")))
.build()

produces an empty file, while modifying path to be path("test") produces expected output of

test:
  basic:
    name: "hello"
    lore:
      - "world"

[Sxtanna]

relevant: This only happens when Bean properties, basic types Integer, Boolean, String, all seem to function normally.

[ljacqu]

New behavior: if there is a property at root level (i.e. path is ""), then an empty YAML file will make ConfigMe consider the path to be missing and the default value will be used. To have an empty map as property value on root level, it is now necessary to explicitly write that empty map into the file (the YAML file's contents have to be {}).