fix(tensorstore): Only log missing times when they are missing

Author: devsjc

src/nwp_consumer/internal/entities/tensorstore.py

@@ -545,7 +545,8 @@ def missing_times(self) -> ResultE[list[dt.datetime]]:
                 if d != "init_time"
             }).isnull().all().values:
                 missing_times.append(pd.Timestamp(it).to_pydatetime().replace(tzinfo=dt.UTC))
-        log.debug(f"NaNs in init times '{missing_times}' suggest they are missing, will redownload")
+        if len(missing_times) > 0:
+            log.debug(f"NaNs in init times '{missing_times}' suggest they are missing, will redownload")
         return Success(missing_times)
 
     @staticmethod