Initialize AppleTVConfigFlow.identifiers (#134443)

homeassistant/components/apple_tv/config_flow.py

@@ -98,7 +98,6 @@ class AppleTVConfigFlow(ConfigFlow, domain=DOMAIN):
     VERSION = 1
 
     scan_filter: str | None = None
-    all_identifiers: set[str]
     atv: BaseConfig | None = None
     atv_identifiers: list[str] | None = None
     _host: str  # host in zeroconf discovery info, should not be accessed by other flows
@@ -118,6 +117,7 @@ class AppleTVConfigFlow(ConfigFlow, domain=DOMAIN):
     def __init__(self) -> None:
         """Initialize a new AppleTVConfigFlow."""
         self.credentials: dict[int, str | None] = {}  # Protocol -> credentials
+        self.all_identifiers: set[str] = set()
 
     @property
     def device_identifier(self) -> str | None: