[CONFIGURATION] INIConfiguration with empty section key not supported

[Steiner Thomas]

Hi,

should it possible to parse an ini-File with an empty section key with 
commons-configuration2 2.10.1?

Or is there any intended purpose why the following example doesn't work:
    INIConfiguration iniConfiguration = new INIConfiguration();
    try (FileReader fileReader = new FileReader(file)) {
      iniConfiguration.read(fileReader);
    } catch (ConfigurationException | IOException e) {
      e.printStackTrace();
    }
    SubnodeConfiguration subSection = iniConfiguration.getSection("");
    String nextKey = subSection.getKeys().next();
    assertNotNull(nextKey);
    assertEquals("property", nextKey);
    Object nextValue = subSection.getProperty(nextKey);
    assertNotNull(nextValue); // FIXME: value is null
    assertEquals("property1", nextValue);

emptySection.ini:
  []
  property = "property1"

The value is null due to the keyBuffer's length in the DefaultConfigurationKey 
is 0 and the endIndex is also 0 so the KeyIterator's hasNext() is false.

Sections with a space (' ') are parsed as expected:
    INIConfiguration iniConfiguration = new INIConfiguration();
    try (FileReader fileReader = new FileReader(file)) {
      iniConfiguration.read(fileReader);
    } catch (ConfigurationException | IOException e) {
      e.printStackTrace();
    }
    SubnodeConfiguration subSection = iniConfiguration.getSection(" ");
    String nextKey = subSection.getKeys().next();
    assertNotNull(nextKey);
    assertEquals("property", nextKey);
    Object nextValue = subSection.getProperty(nextKey);
    assertNotNull(nextValue);
    assertEquals("property1", nextValue);

spaceSection.ini:
  [ ]
  property = "property1"

Best regards,
Thomas Steiner

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