Guard save_cache() where needed

Author: bouwew

plugwise_usb/nodes/circle.py

@@ -441,7 +441,8 @@ async def energy_update(self) -> EnergyStatistics | None:  # noqa: PLR0911 PLR09
                     )
                     return None
 
-            await self.save_cache()
+            if self._cache_enabled:
+                await self.save_cache()
 
         if (
             missing_addresses := self._energy_counters.log_addresses_missing
@@ -531,7 +532,8 @@ async def _get_initial_energy_logs(self) -> None:
             log_address, _ = calc_log_address(log_address, 1, -4)
             total_addresses -= 1
 
-        await self.save_cache()
+        if self._cache_enabled:
+            await self.save_cache()
 
     async def get_missing_energy_logs(self) -> None:
         """Task to retrieve missing energy logs."""
@@ -566,7 +568,8 @@ async def get_missing_energy_logs(self) -> None:
                 await gather(*to_cancel, return_exceptions=True)
                 break
 
-        await self.save_cache()
+        if self._cache_enabled:
+            await self.save_cache()
 
     async def energy_log_update(
         self, address: int | None, save_cache: bool = True