Fix: Allow empty string for spring.flyway.ignore-migration-patterns

Allows 'spring.flyway.ignore-migration-patterns' to be set to an empty
string to align with Flyway's documented behavior for unsetting
default migration patterns.

Signed-off-by: Chanwon-Seo <scwonn60@gmail.com>

Author: Chanwon-Seo

module/spring-boot-flyway/src/main/java/org/springframework/boot/flyway/autoconfigure/FlywayAutoConfiguration.java

@@ -320,7 +320,6 @@ private void configureProperties(FluentConfiguration configuration, FlywayProper
 			map.from(properties.getSkipExecutingMigrations())
 				.to((skipExecutingMigrations) -> configuration.skipExecutingMigrations(skipExecutingMigrations));
 			map.from(properties.getIgnoreMigrationPatterns())
-				.whenNot(List::isEmpty)
 				.to((ignoreMigrationPatterns) -> configuration
 					.ignoreMigrationPatterns(ignoreMigrationPatterns.toArray(new String[0])));
 			map.from(properties.getDetectEncoding())

module/spring-boot-flyway/src/test/java/org/springframework/boot/flyway/autoconfigure/FlywayAutoConfigurationTests.java

@@ -897,6 +897,14 @@ void ignoreMigrationPatternsCorrectlyMapped() {
 				.containsExactly(ValidatePattern.fromPattern("*:missing")));
 	}
 
+	@Test
+	void ignoreMigrationPatternsIsEmpty() {
+		this.contextRunner.withUserConfiguration(EmbeddedDataSourceConfiguration.class)
+			.withPropertyValues("spring.flyway.ignore-migration-patterns=")
+			.run((context) -> assertThat(context.getBean(Flyway.class).getConfiguration().getIgnoreMigrationPatterns())
+				.isEmpty());
+	}
+
 	private ContextConsumer<AssertableApplicationContext> validateFlywayTeamsPropertyOnly(String propertyName) {
 		return (context) -> {
 			assertThat(context).hasFailed();