code: @Override
      public void removeAppender(String name) {
          if (name == null || aai == null) {
              return;
          }
          Appender appender = aai.getAppender(name);
          aai.removeAppender(name);
          if (appender != null) {
              fireRemoveAppenderEvent(appender);
          }
      }
docs: /*
  (non-Javadoc)
  
  @see org.apache.log4j.Category#removeAppender(java.lang.String)