Fix: crash when invalid uri is requested

pages/repo.ts

@@ -13,7 +13,7 @@ async function fetchFile(file: string): Promise<Readable> {
     return await client.getObject(config.minio.bucket, file);
   } catch(err: unknown) {
     console.log(`Fail to fetch ${file}`);
-    throw Error("Required resource doen't exist.");
+    throw URIError("Required resource doen't exist.");
   }
 }
 
@@ -37,7 +37,10 @@ class Repo extends Page{
 				});
 			});
 		} catch(err: unknown) {
-      res.status(404).send(err as string);
+      if (err instanceof URIError) {
+        res.status(404).send(String(err));
+        return;
+      }
       if (err instanceof Error) throw err;
       else throw Error(String(err));
     }