Polish "Polish empty string checks"

See gh-23550

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitProperties.java

@@ -290,7 +290,7 @@ public class RabbitProperties {
 	}
 
 	public void setVirtualHost(String virtualHost) {
-		this.virtualHost = StringUtils.hasLength(virtualHost) ? virtualHost : "/";
+		this.virtualHost = StringUtils.hasText(virtualHost) ? virtualHost : "/";
 	}
 
 	public AddressShuffleMode getAddressShuffleMode() {

spring-boot-project/spring-boot-cli/src/main/java/org/springframework/boot/cli/command/shell/CommandCompleter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.

spring-boot-project/spring-boot-tools/spring-boot-configuration-processor/src/main/java/org/springframework/boot/configurationprocessor/metadata/ConfigurationMetadata.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.