Refactor mosaic cache update condition

Move the condition for updating mosaic cache info into the main invalidation function block to ensure it only runs after invalidations are processed. This change improves the logical grouping of operations and maintains the correct sequence of cache invalidation followed by cache info update.

src/mosaic_cache_invalidation_job.mjs

@@ -159,17 +159,17 @@ async function invalidateMosaicCache() {
         await invalidateImage(geojson, maxzoom, mosaicCacheKeys);
       }
     }
-  }
 
-  if (imagesAddedSinceLastInvalidation.length > 0) {
-    await cachePut(
-      Buffer.from(
-        JSON.stringify({
-          last_updated: latestUploadedAt,
-        })
-      ),
-      "__info__.json"
-    );
+    if (imagesAddedSinceLastInvalidation.length > 0) {
+      await cachePut(
+        Buffer.from(
+          JSON.stringify({
+            last_updated: latestUploadedAt,
+          })
+        ),
+        "__info__.json"
+      );
+    }
   }
 
   logger.debug("Mosaic cache invalidation ended");