ignore if info command is not available on server

Author: ivanB1975

index.js

@@ -380,9 +380,16 @@ RedisClient.prototype.on_ready = function () {
 
 RedisClient.prototype.on_info_cmd = function (err, res) {
     if (err) {
+        /* ignore if the command info is not existing */
+        if (err.message === "ERR unknown command 'info'"){
+          this.server_info = {};
+          this.on_ready();
+          return;
+        } else {
         err.message = 'Ready check failed: ' + err.message;
         this.emit('error', err);
         return;
+       }
     }
 
     /* istanbul ignore if: some servers might not respond with any info data. This is just a safety check that is difficult to test */