fix: return empty array if manifest doesnt have functions defined (#5434)

Author: khendrikse

src/lib/edge-functions/internal.mjs

@@ -32,7 +32,7 @@ export const getInternalFunctions = async () => {
     }
 
     const data = {
-      functions: manifest.functions,
+      functions: manifest.functions || [],
       path,
     }