crypto: simplify api/forms key validation

authentik/crypto/api.py

@@ -22,8 +22,7 @@ class CertificateKeyPairSerializer(ModelSerializer):
     def validate_key_data(self, value):
         """Verify that input is a valid PEM RSA Key"""
         # Since this field is optional, data can be empty.
-        if value == "":
-            return value
+        if value != "":
             try:
                 load_pem_private_key(
                     str.encode("\n".join([x.strip() for x in value.split("\n")])),

authentik/crypto/forms.py

@@ -26,8 +26,7 @@ class CertificateKeyPairForm(forms.ModelForm):
         """Verify that input is a valid PEM RSA Key"""
         key_data = self.cleaned_data["key_data"]
         # Since this field is optional, data can be empty.
-        if key_data == "":
-            return key_data
+        if key_data != "":
             try:
                 load_pem_private_key(
                     str.encode("\n".join([x.strip() for x in key_data.split("\n")])),