crypto: catch error when loading private key

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

authentik/crypto/models.py

@@ -55,11 +55,14 @@ class CertificateKeyPair(CreatedUpdatedModel):
     def private_key(self) -> Optional[RSAPrivateKey]:
         """Get python cryptography PrivateKey instance"""
         if not self._private_key and self._private_key != "":
+            try:
                 self._private_key = load_pem_private_key(
                     str.encode("\n".join([x.strip() for x in self.key_data.split("\n")])),
                     password=None,
                     backend=default_backend(),
                 )
+            except ValueError:
+                return None
         return self._private_key
 
     @property