Fix weekly summary crash on open entries

print_summary_weekly, print_summary_weekly_totals and _aggregate summed
raw duration_hours, which is None for open (unfinished) entries, raising
TypeError: float + NoneType. Skip open entries from the weekly totals,
matching to_csv_entries and parser.aggregate. Add regression tests.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/timesheets/output.py

@@ -163,7 +163,12 @@ def print_summary_weekly(
     day_sections: list[tuple[date, list[dict]]], project_map: dict
 ) -> None:
     """Print a full summary for each day of the week."""
-    week_total = sum(e["duration_hours"] for _, rows in day_sections for e in rows)
+    week_total = sum(
+        e["duration_hours"]
+        for _, rows in day_sections
+        for e in rows
+        if e["duration_hours"] is not None
+    )
     for day, rows in day_sections:
         aggregated = _aggregate(rows)
         day_total = sum(e["quantity"] for e in aggregated)
@@ -221,7 +226,9 @@ def print_summary_weekly_totals(
     rows_out = []
 
     for day, rows in day_sections:
-        day_total = sum(e["duration_hours"] for e in rows)
+        day_total = sum(
+            e["duration_hours"] for e in rows if e["duration_hours"] is not None
+        )
         week_total += day_total
         rows_out.append((day.strftime("%A"), day.strftime("%Y-%m-%d"), day_total))
 
@@ -245,6 +252,8 @@ def _aggregate(rows: list[dict]) -> list[dict]:
     key_order: list[tuple] = []
     totals: dict[tuple, float] = defaultdict(float)
     for row in rows:
+        if row["duration_hours"] is None:
+            continue
         description = build_description(row["story"], row["note"])
         key = (row["project"].strip(), description)
         if key not in totals:

tests/test_output.py

@@ -1,4 +1,5 @@
 import csv
+import datetime
 import io
 
 import pytest
@@ -6,6 +7,9 @@ import pytest
 from timesheets.output import (
     print_stories,
     print_summary,
+    print_summary_weekly,
+    print_summary_weekly_short,
+    print_summary_weekly_totals,
     to_csv_entries,
     write_csv,
     write_csv_weekly,
@@ -330,3 +334,38 @@ class TestPrintStories:
         print_stories([])
         out = capsys.readouterr().out
         assert out == ""
+
+
+# ---------------------------------------------------------------------------
+# Weekly summaries with open (unfinished) entries
+# ---------------------------------------------------------------------------
+
+
+class TestWeeklySummaryOpenEntries:
+    """An open entry (start present, end absent) has duration_hours=None and
+    must be skipped from totals, not crash the weekly summary commands."""
+
+    def _sections(self):
+        rows = [
+            _raw_row("bugs", "ticket 1", "", 1.0),
+            _raw_row("bugs", "ticket 2", "", None),  # open entry
+        ]
+        return [(datetime.date(2026, 1, 6), rows)]
+
+    def test_weekly_totals_skips_open_entry(self, capsys):
+        print_summary_weekly_totals(self._sections(), {})
+        out = capsys.readouterr().out
+        # only the 1.0h closed entry counts
+        assert "01:00" in out
+        assert "WEEK TOTAL" in out
+
+    def test_weekly_full_skips_open_entry(self, capsys):
+        print_summary_weekly(self._sections(), {})
+        out = capsys.readouterr().out
+        assert "WEEK TOTAL" in out
+        assert "01:00" in out
+
+    def test_weekly_short_skips_open_entry(self, capsys):
+        print_summary_weekly_short(self._sections(), {})
+        out = capsys.readouterr().out
+        assert "01:00" in out