fix invalid urls

main.py

@@ -69,6 +69,13 @@ async def picable(interaction: Interaction, owner: str, repository: str):
     url = f"https://api.github.com/repos/{owner}/{repository}"
     headers = {"Authorization": f"token {github_token}"}
     response = requests.get(url, headers=headers)
+
+    if not response.status_code == 200:
+        await interaction.followup.send(
+            f"Invalid Repository. Please check the repository name and owner and try again. :x:"
+        )
+        return
+
     response.raise_for_status()
     repo_info = response.json()
     repository_size_kb = repo_info["size"]