docs: fix broken initials doctests and add release_log entry for initials fix

The usage.rst initials doctests had unterminated strings, wrong expected
output (Python list repr, leaked global initials_format), and a missing
blank line after a doctest directive. Fix them to pass under the doctest
builder and reset CONSTANTS.initials_format so they don't leak state.
Add an Unreleased release_log entry for the initials() None fix, the
python -m nameparser CLI, and the pytest test reorg.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: derek73

docs/release_log.rst

@@ -1,5 +1,9 @@
 Release Log
 ===========
+* Unreleased
+    - Fix ``initials()`` interpolating the literal ``None`` for empty name parts when ``empty_attribute_default = None`` (e.g. ``"J. None D."``); empty parts now render as an empty string and a fully-empty result returns ``empty_attribute_default``
+    - Add ``python -m nameparser "Name String"`` command-line helper that prints a parsed name
+    - Reorganize the test suite from a single ``tests.py`` into a ``tests/`` pytest package
 * 1.2.0 - June 11, 2026
     - Drop Python 2 and Python < 3.10 support; Python 3.10–3.14 now required
     - Add type hints and type declarations (PEP 561 ``py.typed`` marker)

docs/usage.rst

@@ -191,8 +191,9 @@ Three attributes exist for the format, `first`, `middle` and `last`.
   >>> CONSTANTS.initials_format = "{first} {middle}"
   >>> HumanName("Doe, John A. Kenneth, Jr.").initials()
   'J. A. K.'
-  >>> HumanName("Doe, John A. Kenneth, Jr.", initials_format="{last}, {first}).initials()
+  >>> HumanName("Doe, John A. Kenneth, Jr.", initials_format="{last}, {first}").initials()
   'D., J.'
+  >>> CONSTANTS.initials_format = "{first} {middle} {last}"
 
 
 Furthermore, the delimiter for the string output can be set through:
@@ -201,16 +202,15 @@ Furthermore, the delimiter for the string output can be set through:
 .. doctest:: initials delimiter
 
   >>> HumanName("Doe, John A. Kenneth, Jr.", initials_delimiter=";").initials()
-  "J; A; K;"
-  >>> from nameparser.config import CONSTANTS
-  >>> CONSTANTS.initials_delimiter = "."
-  >>> HumanName("Doe, John A. Kenneth, Jr.", initials_format="{first}{middle}{last}).initials()
-  "J.A.K.D."
+  'J; A; K; D;'
+  >>> HumanName("Doe, John A. Kenneth, Jr.", initials_format="{first}{middle}{last}", initials_delimiter=".").initials()
+  'J.A. K.D.'
 
 To get a list representation of the initials, use :py:meth:`~nameparser.HumanName.initials_list`.
 This function is unaffected by :py:attr:`~nameparser.config.Constants.initials_format`
 
 .. doctest:: list format
+
   >>> HumanName("Doe, John A. Kenneth, Jr.", initials_delimiter=";").initials_list()
-  ["J", "A", "K", "D"]
+  ['J', 'A', 'K', 'D']