Revert "Test optional directories without sub-directories"

This reverts commit 3f858ed
since the test already existed.

Author: philwebb

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/ConfigDataEnvironmentPostProcessorIntegrationTests.java

@@ -719,12 +719,6 @@ void runWhenMandatoryWildcardLocationHasNoSubdirectories() {
 						"Config data location 'file:src/test/resources/config/0-empty/*/' contains no subdirectories");
 	}
 
-	@Test
-	void runWhenOptionalWildcardLocationHasNoSubdirectories() {
-		assertThatNoException().isThrownBy(() -> this.application
-				.run("--spring.config.location=optional:file:src/test/resources/config/0-empty/*/"));
-	}
-
 	@Test
 	void runWhenHasMandatoryWildcardLocationThatDoesNotExist() {
 		assertThatExceptionOfType(ConfigDataLocationNotFoundException.class)