Allow withTlsSocketStrategyFactory to work without SSL bundle

Update `HttpComponentsHttpClientBuilder` so that
`withTlsSocketStrategyFactory` is called even if there is no SSL
bundle.

See gh-43422

Author: philwebb

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/http/client/HttpComponentsHttpClientBuilder.java

@@ -119,7 +119,9 @@ public HttpComponentsHttpClientBuilder withSocketConfigCustomizer(
 	 * Return a new {@link HttpComponentsHttpClientBuilder} with a replacement
 	 * {@link TlsSocketStrategy} factory.
 	 * @param tlsSocketStrategyFactory the new factory used to create a
-	 * {@link TlsSocketStrategy} for a given {@link SslBundle}
+	 * {@link TlsSocketStrategy}. The function will be provided with a {@link SslBundle}
+	 * or {@code null} if no bundle is selected. Only non {@code null} results will be
+	 * applied.
 	 * @return a new {@link HttpComponentsHttpClientBuilder} instance
 	 */
 	public HttpComponentsHttpClientBuilder withTlsSocketStrategyFactory(
@@ -166,9 +168,9 @@ public CloseableHttpClient build(HttpClientSettings settings) {
 	private PoolingHttpClientConnectionManager createConnectionManager(HttpClientSettings settings) {
 		PoolingHttpClientConnectionManagerBuilder builder = PoolingHttpClientConnectionManagerBuilder.create()
 			.useSystemProperties();
-		PropertyMapper map = PropertyMapper.get().alwaysApplyingWhenNonNull();
+		PropertyMapper map = PropertyMapper.get();
 		builder.setDefaultSocketConfig(createSocketConfig(settings));
-		map.from(settings::sslBundle).as(this.tlsSocketStrategyFactory).to(builder::setTlsSocketStrategy);
+		map.from(settings::sslBundle).as(this.tlsSocketStrategyFactory).whenNonNull().to(builder::setTlsSocketStrategy);
 		this.connectionManagerCustomizer.accept(builder);
 		return builder.build();
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/http/client/HttpComponentsSslBundleTlsStrategy.java

@@ -37,6 +37,9 @@ private HttpComponentsSslBundleTlsStrategy() {
 	}
 
 	static DefaultClientTlsStrategy get(SslBundle sslBundle) {
+		if (sslBundle == null) {
+			return null;
+		}
 		SslOptions options = sslBundle.getOptions();
 		SSLContext sslContext = sslBundle.createSslContext();
 		return new DefaultClientTlsStrategy(sslContext, options.getEnabledProtocols(), options.getCiphers(), null,