Issue #2029505 by penyaskito, YesCT, Gábor Hojtsy: Fixed Exporting...

Issue #2029505 by penyaskito, YesCT, Gábor Hojtsy: Fixed Exporting translations does not correctly generate empty strings.

core/lib/Drupal/Component/Gettext/PoItem.php

@@ -256,8 +256,8 @@ private function formatPlural() {
    */
   private function formatSingular() {
     $output = '';
-    $output .= 'msgid '. $this->formatString($this->_source);
-    $output .= 'msgstr '. (isset($this->_translation) ? $this->formatString($this->_translation) : '');
+    $output .= 'msgid ' . $this->formatString($this->_source);
+    $output .= 'msgstr ' . (isset($this->_translation) ? $this->formatString($this->_translation) : '""');
     return $output;
   }
 

core/modules/locale/lib/Drupal/locale/Tests/LocaleExportTest.php

@@ -113,8 +113,8 @@ function testExportTranslation() {
     $this->assertRaw('# French translation of Drupal', t('Exported French translation file with only untranslated strings.'));
     // Ensure no customized translations exist in the file.
     $this->assertNoRaw('msgstr "janvier"', t('French custom translation not present in exported file.'));
-    // Ensure the untranslated strings exist in the file.
-    $this->assertRaw('msgid "February"', t('Untranslated string present in exported file.'));
+    // Ensure the untranslated strings exist in the file, and with right quotes.
+    $this->assertRaw($this->getUntranslatedString(), t('Empty string present in exported file.'));
   }
 
   /**
@@ -165,6 +165,19 @@ function getCustomPoFile() {
 
 msgid "January"
 msgstr "janvier"
+EOF;
+  }
+
+  /**
+   * Returns a .po file fragment with an untranslated string.
+   *
+   * @return string
+   *   A .po file fragment with an untranslated string.
+   */
+  function getUntranslatedString() {
+    return <<< EOF
+msgid "February"
+msgstr ""
 EOF;
   }