[hugo] Don't throw an exception if exiting preview
diff --git a/util/build_docs.py b/util/build_docs.py
index d21485d..4f8105d 100755
--- a/util/build_docs.py
+++ b/util/build_docs.py
@@ -220,6 +220,8 @@
         logging.info("Hugo not found. Installing local copy and re-trying.")
         install_hugo(hugo_localinstall_dir)
         invoke_hugo(args.preview)
+    except KeyboardInterrupt:
+        pass
 
 
 if __name__ == "__main__":