Fix some issues with NFT code samples

_code-samples/non-fungible-token/README.md

@@ -0,0 +1,3 @@
+# NFT Examples
+
+Various NFT-related actions. Also see the [Quickstart Samples](../quickstart/) for more code related to NFT tutorials.

_code-samples/non-fungible-token/js/list-nft-pages-and-buy-offers.js

@@ -1,14 +1,11 @@
-if (typeof module !== "undefined") {
+// List an account’s NFT pages and see token offers for that account’s NFTs
-    // Use var here because const/let are block-scoped to the if statement.
+// https://xrpl.org/account_nfts.html#account_nfts
-    var xrpl = require('xrpl')
+// https://xrpl.org/nft_buy_offers.html#nft_buy_offers
-  }
-  // List an account’s NFT pages and see token offers for that account’s NFTs
-  // https://xrpl.org/account_nfts.html#account_nfts
-  // https://xrpl.org/nft_buy_offers.html#nft_buy_offers
 
-  async function main() {
+const xrpl = require('xrpl')
-    // Testnet example: r3CJF73Ugs5cT4G58CDBp6RAmycGdnTAFN
+
-    account = "r3CJF73Ugs5cT4G58CDBp6RAmycGdnTAFN"
+async function main() {
+    account = "rP7aApVAyf3bjtRVVTixVSHBbU4kpd742k"
 
     // Connect to a testnet node
     console.log("Connecting to testnet...")
@@ -30,11 +27,17 @@ if (typeof module !== "undefined") {
     // Query through the NFTs' buy Offers
     // For each NFT owned by the account (on nft_keylets[]), go through all their respective buy Offers on the DEX
     for (var i = 0; i < nft_keylets.length ; i++) {
-        const response_1 = await client.request({
+        let response_1;
+        try {
+            response_1 = await client.request({
                 "command": "nft_buy_offers",
                 "nft_id": nft_keylets[i],
                 "ledger_index": "validated"
             })
+        } catch(e) {
+            console.log(`Couldn't get buy offers for NFT ${nft_keylets[i]}. Maybe there aren't any.`)
+            continue
+        }
         
         console.log(`\nBuy Offers for NFT ${nft_keylets[i]}:`)
         for (var i = 0; i < response_1.result.offers.length; i++) {
@@ -47,6 +50,6 @@ if (typeof module !== "undefined") {
     }
     client.disconnect()
     // End main()
-  }
+}
 
-  main()
+main()

_code-samples/non-fungible-token/js/package-lock.json

@@ -0,0 +1,226 @@
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+    "requires": true,
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+                "ripple-binary-codec": "^2.0.0",
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+}

_code-samples/non-fungible-token/js/package.json

@@ -0,0 +1,6 @@
+{
+    "dependencies": {
+        "xrpl": "^3.0.0"
+    }
+}
+  

_code-samples/non-fungible-token/py/list-nft-pages-and-offers.py

@@ -8,7 +8,7 @@ from xrpl.clients import JsonRpcClient
 # https://xrpl.org/nftokenpage.html#nftokenpage
 # https://xrpl.org/nft_buy_offers.html#nft_buy_offers
 
-# Testnet example: r3CJF73Ugs5cT4G58CDBp6RAmycGdnTAFN
+# Testnet example: rP7aApVAyf3bjtRVVTixVSHBbU4kpd742k
 account = input("Enter wallet address: ")
 
 # Connect to a testnet node