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

@@ -191,7 +191,7 @@ 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)
+    if (userID != -1) {
 	    res.render("pages/user",
 		{
 		    config,
@@ -205,10 +205,18 @@ app.get("/user/:username", (req, res) => {
 		    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,