Fix UnboundLocalError when no enclosures present

routers/overview.py

@@ -43,6 +43,8 @@ async def get_overview(response: Response):
     warnings = 0
     errors = 0
     all_healthy = True
+    all_cache_hits = True
+    any_lookups = False
 
     for enc_idx, enc in enumerate(enclosures_raw):
         slots_raw = list_slots(enc["id"])
@@ -53,8 +55,6 @@ async def get_overview(response: Response):
         smart_results = await asyncio.gather(*smart_tasks, return_exceptions=True)
 
         smart_map: dict[str, dict] = {}
-        all_cache_hits = True
-        any_lookups = False
         for (slot_info, dev), result in zip(populated, smart_results):
             if isinstance(result, Exception):
                 logger.warning("SMART query failed for %s: %s", dev, result)