Fix tiny bug where list command failed when given no backend resources.

Author: taeold

src/commands/frameworks-backends-list.ts

@@ -48,7 +48,7 @@ export const command = new Command("backends:list")
   });
 
 function populateTable(backendsLists: gcp.ListBackendsResponse, location: string, table: any) {
-  for (const backend of backendsLists.backends) {
+  for (const backend of backendsLists.backends ?? []) {
     const [location, , backendId] = backend.name.split("/").slice(3, 6);
     const entry = [
       backendId,