ensure None is handled correctly in search_issues() (#1434)

jira/client.py

@@ -2930,6 +2930,8 @@ def search_issues(
         """
         if isinstance(fields, str):
             fields = fields.split(",")
+        elif fields is None:
+            fields = ["*all"]
 
         # this will translate JQL field names to REST API Name
         # most people do know the JQL names so this will help them use the API easier

tests/resources/test_issue.py

@@ -37,10 +37,17 @@ def test_issue_search_only_includes_provided_fields(self):
         self.assertFalse(hasattr(issues[0].fields, "reporter"))
 
     def test_issue_search_default_behaviour_included_fields(self):
-        issues = self.jira.search_issues("key=%s" % self.issue_1)
+        search_str = f"key={self.issue_1}"
+        issues = self.jira.search_issues(search_str)
         self.assertTrue(hasattr(issues[0].fields, "reporter"))
         self.assertTrue(hasattr(issues[0].fields, "comment"))
 
+        # fields=None should be valid and return all fields (ie. default behavior)
+        self.assertEqual(
+            self.jira.search_issues(search_str),
+            self.jira.search_issues(search_str, fields=None),
+        )
+
     def test_issue_get_field(self):
         issue = self.jira.issue(self.issue_1)
         self.assertEqual(