From 2ae66468853873d0927c2caf11bcb64ad57bebf7 Mon Sep 17 00:00:00 2001
From: "Veronica K. B. Olsen" <1619840+vkbo@users.noreply.github.com>
Date: Sat, 19 Sep 2020 16:38:31 +0200
Subject: [PATCH] Added a check in merge documents that there is actually
 something to merge

---
 nw/gui/docmerge.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/nw/gui/docmerge.py b/nw/gui/docmerge.py
index 06eb226a..d8650ecb 100644
--- a/nw/gui/docmerge.py
+++ b/nw/gui/docmerge.py
@@ -101,6 +101,12 @@ class GuiDocMerge(QDialog):
         for i in range(self.listBox.count()):
             finalOrder.append(self.listBox.item(i).data(Qt.UserRole))
 
+        if len(finalOrder) == 0:
+            self.theParent.makeAlert((
+                "No source documents found. Nothing to do."
+            ), nwAlert.ERROR)
+            return
+
         theDoc = NWDoc(self.theProject, self.theParent)
         theText = ""
         for tHandle in finalOrder: