Ignore formatting of command output

Related #6

src/main/java/com/github/games647/colorconsole/bukkit/ColorPluginAppender.java

@@ -37,6 +37,11 @@ public class ColorPluginAppender extends ColorAppender {
     @Override
     public LogEvent onAppend(LogEvent logEvent) {
         String oldMessage = logEvent.getMessage().getFormattedMessage();
+        if (logEvent.getLoggerName().isEmpty()) {
+            // ignore non logging messages like command output
+            return logEvent;
+        }
+
         String prefix = '[' + logEvent.getLoggerName() + "] ";
 
         //PaperSpigot append prefix

src/main/java/com/github/games647/colorconsole/bungee/ColorPluginAppender.java

@@ -27,6 +27,10 @@ public class ColorPluginAppender extends ColorAppender {
     public LogEvent onAppend(LogEvent logEvent) {
         String message = logEvent.getMessage().getFormattedMessage();
         String loggerName = logEvent.getLoggerName();
+        if (logEvent.getLoggerName().isEmpty()) {
+            // ignore non logging messages like command output
+            return logEvent;
+        }
 
         //old message + potential prefix and color codes
         StringBuilder msgBuilder = new StringBuilder(message.length() + loggerName.length() + 10);