added new error case to socket.js

1 files changed, 2 insertions, 3 deletions

diff --git a/socket.js b/socket.js
index aefc1c0..c165597 100644
--- a/socket.js
+++ b/socket.js
@@ -60,9 +60,8 @@ class Socket extends retryws {
     }
 
     this.write = function(chars){ //chars is an list of pairs [ pixel coordinate (y/x < 16), char ]
-      if (chars.length > 200){
-        throw "Too many characters to write by server decree";
-      }
+      if (chars.length > 200) throw "Too many characters to write by server decree";
+      if (chars.length == 0) throw "Send at least a character.";
       let write = [];
       for (let cha of chars){
         let coord = cha[0];