Fix broken tests

noxfile.py

@@ -1,3 +1,5 @@
+# type: ignore
+
 """Nox sessions."""
 
 import os

src/gw/property_format.py

@@ -34,13 +34,15 @@ def check_is_market_slot_name_lrd_format(v: str) -> None:
  x = v.split(".")
  except AttributeError as e:
  raise ValueError(f"{v} failed to split on '.'") from e
+ slot_start_str = x[-1]
  try:
  slot_start = int(x[-1])
  except ValueError as e:
- raise ValueError(f"slot start {slot_start} not an int") from e
- check_is_reasonable_unix_time_s(slot_start)
- if slot_start % 300 != 0:
- raise ValueError(f"slot start {slot_start} not a multiple of 300")
+ raise ValueError(f"slot start {slot_start_str} not an int") from e
+ else:
+ check_is_reasonable_unix_time_s(slot_start)
+ if slot_start % 300 != 0:
+ raise ValueError(f"slot start {slot_start} not a multiple of 300")
 
  market_name = ".".join(x[:-1])
  try: