Fix LoggingApplicationListener

- If `logging.config` is set and could open/read the resource
then, return.
  - Currently, it logs warning though the resource is successfully
read.

spring-boot/src/main/java/org/springframework/boot/logging/LoggingApplicationListener.java

@@ -185,11 +185,10 @@ public class LoggingApplicationListener implements SmartApplicationListener {
 				system.initialize(value);
 			}
 			catch (Exception ex) {
-				// Swallow exception and continue
-			}
 				this.logger.warn("Logging environment value '" + value
 						+ "' cannot be opened and will be ignored");
 			}
+		}
 		else {
 
 			system.initialize();