Made it so if an invalid user or post is loaded, a proper error message is

shown instead of just a nodeJS error message

src/server.js

@@ -191,24 +191,32 @@ app.get("/", (req,res) => {
 app.get("/user/:username", (req, res) => {
     const userID = func.get_userID(req.params.username)
     console.log(userID)
-    console.log(users[userID].prettyname)
-    res.render("pages/user",
-        {
-            config,
-            locale,
-            posts,
-            user: users[userID],
-            userID: userID,
-            comments: comments.comments,
-            fromUnixTime: fromUnixTime,
-            format: format,
-            getUnixTime: getUnixTime,
-            func,
-        })
+    if (userID != -1) {
+	    res.render("pages/user",
+		{
+		    config,
+		    locale,
+		    posts,
+		    user: users[userID],
+		    userID: userID,
+		    comments: comments.comments,
+		    fromUnixTime: fromUnixTime,
+		    format: format,
+		    getUnixTime: getUnixTime,
+		    func,
+		})
+    }
+    else if (userID == -1) {
+	res.render("partials/message",
+		{
+			message: locale.user_doesnt_exist,
+			config,
+		})
+    }
 }); // /user/:username
 app.get("/post/:post_index", (req, res) => {
     const postID = req.params.post_index
-    if (posts[postID]["deleted"] == true) {
+    if (postID > posts.length-1 || posts[postID]["deleted"] == true) {
         res.render("partials/message", {
             message: locale.post_doesnt_exist,
             config,