Return 'already deleted' instead of 'not found' when cert has already been deleted

lemur/certificates/views.py

@@ -691,9 +691,12 @@ class Certificates(AuthenticatedResource):
 
         cert = service.get(certificate_id)
 
-        if not cert or cert.deleted:
+        if not cert:
             return dict(message="Cannot find specified certificate"), 404
 
+        if cert.deleted:
+            return dict(message="Certificate is already deleted"), 412
+
         # allow creators
         if g.current_user != cert.user:
             owner_role = role_service.get_by_name(cert.owner)

lemur/tests/test_certificates.py

@@ -738,7 +738,7 @@ def test_certificate_put_with_data(client, certificate, issuer_plugin):
 @pytest.mark.parametrize("token,status", [
     (VALID_USER_HEADER_TOKEN, 403),
     (VALID_ADMIN_HEADER_TOKEN, 204),
-    (VALID_ADMIN_API_TOKEN, 404),
+    (VALID_ADMIN_API_TOKEN, 412),
     ('', 401)
 ])
 def test_certificate_delete(client, token, status):