fix: handle undefined slug and doctorId in cache functions

app/clinic/[slug]/page.js

@@ -11,6 +11,7 @@ import { imageUrl } from "@/helper";
 const API_URL = process.env.NEXT_PUBLIC_API_URL;
 
 const getClinic = cache(async (slug) => {
+  if (!slug || slug === "undefined") return null;
   const res = await fetch(`${API_URL}/api/v1/clinic/${slug}`, {
     next: { revalidate: 3600, tags: [`clinic-${slug}`] },
   });

app/doctor/[slug]/page.js

@@ -11,6 +11,7 @@ const API_URL = process.env.NEXT_PUBLIC_API_URL;
 const FALLBACK_IMG = "https://nobat724.com/assets/images/logo.png";
 
 const getDoctor = cache(async (slug) => {
+  if (!slug || slug === "undefined") return null;
   const res = await fetch(`${API_URL}/api/v1/doctor/${slug}`, {
     next: { revalidate: 3600, tags: [`doctor-${slug}`] },
   });
@@ -21,6 +22,7 @@ const getDoctor = cache(async (slug) => {
 });
 
 const getDoctorAddresses = cache(async (doctorId) => {
+  if (!doctorId) return [];
   try {
     const res = await fetch(`${API_URL}/api/v1/clinic-pro/doctor-addresses/${doctorId}`, {
       next: { revalidate: 3600, tags: [`doctor-addresses-${doctorId}`] },