Tighten configuration and export handling

tests/test_utils.py

@@ -1,7 +1,7 @@
 from redmine_reporter.utils import (
-    hours_to_human,
     get_month_name_from_range,
     get_version,
+    hours_to_human,
 )
 
 
@@ -74,10 +74,7 @@ def test_get_version_without_attribute():
 
 
 def test_get_version_none_attribute():
-    """fixed_version = None -- str(None) == 'None', не '<N/A>'."""
-
     class MockIssue:
         fixed_version = None
 
-    # get_version возвращает str(getattr(...)), None задан явно -> "None"
-    assert get_version(MockIssue()) == "None"
+    assert get_version(MockIssue()) == "<N/A>"