MAINT-24: read the last row without a bare index (test_named_absence)

Co-Authored-By: Claude <noreply@anthropic.com>

goodwe_controller/test_maint24.py

@@ -124,15 +124,16 @@ CH = sc.MAINT_CHARGE
 print("1. A in maintenance CHARGE, B a charger in the cheap window")
 rows, st, c = scen(a=CH)
 ma, mb = mean(rows, "a"), mean(rows, "b")
+last = rows[-1] if rows else {}
 print(f"    A {ma:+.0f} W, B {mb:+.0f} W, worst quarter {worst_quarter(st):.0f}"
-      f" W, why {rows[-1]['why']}, roles {rows[-1]['roles']}")
+      f" W, why {last.get('why')}, roles {last.get('roles')}")
 check("A charges at (5950 - 3000) / 2 = 1475 W, not 0 or a few hundred W",
       -1500.0 <= ma <= -1440.0)
 check("B files no grid trade: no trade action in the run, B near 0 W",
       all("CHARGE" not in str(r["action"]) for r in rows) and mb > -50.0)
 check("roles: B does not charge, and the why is 'cycle'",
       all(r["roles"].get(B) != "charge" for r in rows)
-      and rows[-1]["why"] == "cycle")
+      and last.get("why") == "cycle")
 check("every quarter at or under the month aim",
       worst_quarter(st) <= AIM + 1.0)
 check("A never gives back while there is no real peak",
@@ -169,12 +170,13 @@ check("no banked peak: the aim is cap - margin (3450 W) as before, so A "
 print("\n3. the mirror: B in maintenance CHARGE, A the charger")
 rowsm, stm, cm = scen(b=CH, soc=(30.0, 49.0))
 mam, mbm = mean(rowsm, "a"), mean(rowsm, "b")
+lastm = rowsm[-1] if rowsm else {}
 print(f"    A {mam:+.0f} W, B {mbm:+.0f} W, worst quarter "
-      f"{worst_quarter(stm):.0f} W, why {rowsm[-1]['why']}")
+      f"{worst_quarter(stm):.0f} W, why {lastm.get('why')}")
 check("B charges at 1475 W, A files no grid trade, why 'cycle'",
       -1500.0 <= mbm <= -1440.0 and mam > -50.0
       and all("CHARGE" not in str(r["action"]) for r in rowsm)
-      and rowsm[-1]["why"] == "cycle"
+      and lastm.get("why") == "cycle"
       and all(r["roles"].get(A) != "charge" for r in rowsm))
 check("...every quarter at or under the month aim",
       worst_quarter(stm) <= AIM + 1.0)