#29074: django-admin makemessages messes up .po file when fed with empty strings
-------------------------------------+-------------------------------------
               Reporter:             |          Owner:  nobody
  instantname                        |
                   Type:  Bug        |         Status:  new
              Component:  Core       |        Version:  1.11
  (Management commands)              |
               Severity:  Normal     |       Keywords:  i18n
           Triage Stage:             |      Has patch:  0
  Unreviewed                         |
    Needs documentation:  0          |    Needs tests:  0
Patch needs improvement:  0          |  Easy pickings:  0
                  UI/UX:  0          |
-------------------------------------+-------------------------------------
 Django 1.11.9

 == Steps to reproduce

 {{{
 django-admin startproject mysite
 cd mysite/mysite
 mkdir locale
 }}}

 Edit urls.py to add this line at the end:

 {{{
 _('hello')
 }}}

 Create messages:

 {{{
 django-admin makemessages -l de
 }}}

 Edit urls.py again to add this line at the end:

 {{{
 pgettext_lazy('context', '')
 }}}

 Update messages:

 {{{
 django-admin makemessages
 }}}

 == Result

 The locale/de/django.po file obtained is the following:

 {{{
 # SOME DESCRIPTIVE TITLE.
 # Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
 # This file is distributed under the same license as the PACKAGE package.
 # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
 #
 #, fuzzy
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2018-01-27 03:50+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <l...@li.org>\n"
 "Language: \n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"

 #: urls.py:23
 msgid "hello"
 msgstr ""

 # SOME DESCRIPTIVE TITLE.
 # Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
 # This file is distributed under the same license as the PACKAGE package.
 # FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
 #
 #: urls.py:24
 #, fuzzy
 msgctxt "context"
 msgid ""
 msgstr ""
 "Project-Id-Version: PACKAGE VERSION\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2018-01-27 03:49+0100\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <l...@li.org>\n"
 "Language: \n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
 }}}

 The unexpected behavior is the repetition of some header lines. This seems
 to only happen with empty strings in the Python code. While a bit odd, I
 think empty strings are valid strings (at least with a context) that may
 sometimes need translation.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/29074>
Django <https://code.djangoproject.com/>
The Web framework for perfectionists with deadlines.

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