ReplicationFileBasedConfig: fix UnusedException error from ErrorProne

Change-Id: I2b04ba8cb9d88e2a40284f0b40195a522ac260e2
diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationFileBasedConfig.java b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationFileBasedConfig.java
index 9004968..683fb9b 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationFileBasedConfig.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationFileBasedConfig.java
@@ -191,7 +191,7 @@
         result.add(new RemoteConfig(cfg, name));
       } catch (URISyntaxException e) {
         throw new ConfigInvalidException(
-            String.format("remote %s has invalid URL in %s", name, cfg.getFile()));
+            String.format("remote %s has invalid URL in %s", name, cfg.getFile()), e);
       }
     }
     return result;