Avoid CacheAspectSupport#findInCaches fall through to reactive handler

Prior to this commit if the return type is a CompletableFuture but a
cache get returns null, the execution falls through to the
reactiveCachingHandler.

This commit ensures that evaluation instead continues onto the next
cache (if any).

Closes gh-33371

Author: simonbasle

spring-context/src/main/java/org/springframework/cache/interceptor/CacheAspectSupport.java

@@ -510,6 +510,9 @@ private Object findInCaches(CacheOperationContext context, Object key,
 							(value != null ? CompletableFuture.completedFuture(unwrapCacheValue(value)) : null),
 							invoker, method, contexts));
 				}
+				else {
+					continue;
+				}
 			}
 			if (this.reactiveCachingHandler != null) {
 				Object returnValue = this.reactiveCachingHandler.findInCaches(