Update chat.js

Error from chat.js with the following error:
Uncaught (in promise) SyntaxError: Unexpected end of JSON input
    at JSON.parse (<anonymous>)
    at chat.js:191:28
    at Array.forEach (<anonymous>)
    at promptGPT (chat.js:184:11)
Happening when 'data' value is 'data :', which corresponds to an empty json.

Signed-off-by: Xav-v <xavier.vauvelle@outlook.com>

core/http/static/chat.js

@@ -182,7 +182,7 @@ function readInputImage() {
       let dataDone = false;
       const arr = value.split("\n");
       arr.forEach((data) => {
-        if (data.length === 0) return;
+        if (data.length <= 6) return;
         if (data.startsWith(":")) return;
         if (data === "data: [DONE]") {
           dataDone = true;