From a8a140573095cdafaa29530dd23f66a7e4c23ec0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20Mr=C3=A1zek?= <email@honzamrazek.cz>
Date: Sat, 22 Jun 2024 15:53:19 +0200
Subject: [PATCH] Warn user if they didn't specify annotation reference

---
 kikit/panelize_ui_impl.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kikit/panelize_ui_impl.py b/kikit/panelize_ui_impl.py
index a340e0e2..490d72b4 100644
--- a/kikit/panelize_ui_impl.py
+++ b/kikit/panelize_ui_impl.py
@@ -187,6 +187,8 @@ def readSourceArea(specification, board):
             return expandRect(findBoardBoundingBox(board), tolerance)
         if type == "annotation":
             ref = specification["ref"]
+            if ref.strip() == "":
+                raise PresetError("When using source 'annotation' reference cannot be empty.")
             return expandRect(extractSourceAreaByAnnotation(board, ref), tolerance)
         if type == "rectangle":
             tl = VECTOR2I(specification["tlx"], specification["tly"])