Fix empty stat and original param

public/script.js

@@ -1527,7 +1527,6 @@ function scrollChatToBottom() {
 function substituteParams(content, _name1, _name2, _original) {
     _name1 = _name1 ?? name1;
     _name2 = _name2 ?? name2;
-    _original = _original || '';
 
     if (!content) {
         return '';
@@ -1536,7 +1535,9 @@ function substituteParams(content, _name1, _name2, _original) {
     // Replace {{original}} with the original message
     // Note: only replace the first instance of {{original}}
     // This will hopefully prevent the abuse
+    if (typeof _original === 'string') {
         content = content.replace(/{{original}}/i, _original);
+    }
     content = content.replace(/{{input}}/gi, $('#send_textarea').val());
     content = content.replace(/{{user}}/gi, _name1);
     content = content.replace(/{{char}}/gi, _name2);

public/scripts/stats.js

@@ -256,6 +256,19 @@ async function statMesProcess(line, type, characters, this_chid, oldMesssage) {
 
     let stat = charStats[characters[this_chid].avatar];
 
+    if (!stat) {
+        stat = {
+            total_gen_time: 0,
+            user_word_count: 0,
+            non_user_msg_count: 0,
+            user_msg_count: 0,
+            non_user_msg_count: 0,
+            total_swipe_count: 0,
+            date_first_chat: Date.now(),
+            date_last_chat: Date.now(),
+        };
+    }
+
     stat.total_gen_time += calculateGenTime(
         line.gen_started,
         line.gen_finished