Fix null safety bugs in issue and journal articlemeta export formatters (#1415)

* Initial plan

* Fix null safety bugs in issue and journal articlemeta formatters

- issue/_format_collection_info: add null check for scielo_journal
- issue/_format_issn_info: add null check for journal.official
- journal/_format_title_journal_info: add null check for self.official
  before accessing old_title and new_title
- journal/_format_issn_info: fix inconsistent self.obj.official to
  self.official for issn_electronic access

Co-authored-by: robertatakenaka <505143+robertatakenaka@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: robertatakenaka <505143+robertatakenaka@users.noreply.github.com>

Author: Copilot

issue/formats/articlemeta_format.py

@@ -147,6 +147,8 @@ def _format_publication_info(self):
 
     def _format_collection_info(self):
         """Informações de coleção"""
+        if not self.scielo_journal:
+            return
         collection = self.scielo_journal.collection
         if collection:
             add_to_result("v992", collection.acron3, self.result["issue"])
@@ -313,7 +315,7 @@ def _format_article_info(self):
 
     def _format_issn_info(self):
         """Informações de edição"""
-        if self.scielo_journal:
+        if self.scielo_journal and self.scielo_journal.journal and self.scielo_journal.journal.official:
             issn_print = self.scielo_journal.journal.official.issn_print
             issn_electronic = self.scielo_journal.journal.official.issn_electronic
             issn_scielo = self.scielo_journal.issn_scielo

journal/formats/articlemeta_format.py

@@ -115,9 +115,10 @@ def _format_title_journal_info(self):
             add_items("v230", [pt.text for pt in parallel_titles if pt.text], self.result)
 
         add_items("v240", [other_title.title for other_title in self.obj.other_titles.all()], self.result)
-        add_items("v610", [old_title.title for old_title in self.official.old_title.all()], self.result)
-        if title := getattr(self.official.new_title, 'title', None):
-            add_to_result("v710", title, self.result)
+        if self.official:
+            add_items("v610", [old_title.title for old_title in self.official.old_title.all()], self.result)
+            if title := getattr(self.official.new_title, 'title', None):
+                add_to_result("v710", title, self.result)
 
     def _format_collection_info(self):
         if self.scielo_journal and self.scielo_journal.collection:
@@ -245,7 +246,7 @@ def _format_issn_info(self):
         """Informações de ISSN"""
         if self.official:
             issn_print = self.official.issn_print
-            issn_electronic = self.obj.official.issn_electronic
+            issn_electronic = self.official.issn_electronic
             add_to_result("v935", issn_electronic, self.result)
             self._format_issn_list(issn_print, issn_electronic)
             self._format_issn_with_type(issn_print, issn_electronic)