Improve error handling with optional chaining and status code checks

Co-authored-by: diberry <41597107+diberry@users.noreply.github.com>

Author: Copilot

nosql-vector-search-typescript/src/index-and-query.ts

@@ -68,9 +68,10 @@ async function main() {
         console.error('App failed:', error);
 
         // Provide helpful error message if resources don't exist
-        if (error instanceof Error) {
-            if (error.message.includes('NotFound') || error.message.includes('does not exist') || 
-                error.message.includes('ResourceNotFound') || error.message.includes('404')) {
+        if (error instanceof Error || (typeof error === 'object' && error !== null)) {
+            const err = error as any;
+            if (err?.message?.includes('NotFound') || err?.message?.includes('does not exist') || 
+                err?.message?.includes('ResourceNotFound') || err?.code === 404 || err?.statusCode === 404) {
                 console.error('\n=== RESOURCE NOT FOUND ===');
                 console.error(`The database '${config.dbName}' or container '${config.collectionName}' does not exist.`);
                 console.error('\nPlease create these resources before running this sample:');
@@ -84,7 +85,7 @@ async function main() {
         }
 
         process.exitCode = 1;
-    } 
+    }
 }
 
 // Execute the main function

nosql-vector-search-typescript/src/insert-at-scale.ts

@@ -831,8 +831,8 @@ async function main() {
     console.log(`The calculation extrapolates your current usage pattern over a 30-day period.`);
   } catch (err: any) {
     // Provide helpful error message if resources don't exist
-    if (err.message && (err.message.includes('NotFound') || err.message.includes('does not exist') || 
-        err.message.includes('ResourceNotFound') || err.code === 404 || err.statusCode === 404)) {
+    if (err && (err?.message?.includes('NotFound') || err?.message?.includes('does not exist') || 
+        err?.message?.includes('ResourceNotFound') || err?.code === 404 || err?.statusCode === 404)) {
       console.error('\n=== RESOURCE NOT FOUND ===');
       console.error(`The database '${databaseName}' or container '${containerName}' does not exist.`);
       console.error('\nPlease create these resources before running this sample:');