Return an empty dict when loading non existant file

src/storage.py

@@ -12,8 +12,11 @@ class DispatchStorage:
 
     @classmethod
     def load(cls, date: Optional[str] = None) -> Dict[str, List[int]]:
-        with open(cls.path(date), "r") as f:
-            return json.load(f)
+        try:
+            with open(cls.path(date), "r") as f:
+                return json.load(f)
+        except FileNotFoundError:
+            return {}
 
     @classmethod
     def save(cls, dispatch: Dict[str, List[int]], date: Optional[str] = None) -> None: