Avoid calling ByteStore.release() with an empty set

Change-Id: I5ca8b8acc5074d34dba3d01c0841f4c755634518
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/283965
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Auto-Submit: Jaime Wren <jwren@google.com>

pkg/analyzer/lib/src/dart/micro/resolve_file.dart

@@ -496,13 +496,17 @@ class FileResolver {
     );
 
     // Release the linked data, the reference count is `>= 1`.
-    byteStore.release(linkedKeysToRelease);
+    if (linkedKeysToRelease.isNotEmpty) {
+      byteStore.release(linkedKeysToRelease);
+    }
   }
 
   /// Releases from the cache and clear [removedCacheKeys].
   void releaseAndClearRemovedIds() {
-    byteStore.release(removedCacheKeys);
-    removedCacheKeys.clear();
+    if (removedCacheKeys.isNotEmpty) {
+      byteStore.release(removedCacheKeys);
+      removedCacheKeys.clear();
+    }
   }
 
   /// Remove cached [FileState]'s that were not used in the current analysis