add exception log

broker/src/main/java/com/xiaoleilu/loServer/handler/IMActionHandler.java

@@ -20,6 +20,7 @@ import io.netty.channel.Channel;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.SimpleChannelInboundHandler;
 import io.netty.handler.codec.http.FullHttpRequest;
+import io.netty.util.internal.StringUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -37,7 +38,7 @@ public class IMActionHandler extends ActionHandler {
 
     @Override
     boolean isValidePath(String path) {
-        if (!path.startsWith("/admin")) {
+        if (!StringUtil.isNullOrEmpty(path) && !path.startsWith("/admin")) {
             return true;
         }
         return false;