fix: Check for non-null and non-undefined spec of a project to mitigate errors in UI builds

Author: boliri

ui/src/FeastUISansProviders.test.tsx

@@ -55,7 +55,7 @@ test("full app rendering", async () => {
   expect(screen.getByText(/Explore this Project/i)).toBeInTheDocument();
 
   const projectNameRegExp = new RegExp(
-    parsedRegistry.projects[0].spec.name!,
+    parsedRegistry.projects[0].spec?.name!,
     "i"
   );
 

ui/src/queries/useLoadRegistry.ts

@@ -52,7 +52,7 @@ const useLoadRegistry = (url: string) => {
           // });
 
           return {
-            project: objects.projects[0].spec.name!,
+            project: objects.projects[0].spec?.name!,
             objects,
             mergedFVMap,
             mergedFVList,