From 6256bf3a4d24b3b6c54f0a2d76ab03fc4c4b5717 Mon Sep 17 00:00:00 2001
From: Remco Burema <r.burema@ultimaker.com>
Date: Wed, 3 Feb 2021 09:27:58 +0100
Subject: [PATCH] Possible to distinguish between empty and corrupt 3MF.

Otherwise the user could infer valid, but empty workspace is corrupt.

CURA-7996
---
 plugins/3MFReader/ThreeMFReader.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/plugins/3MFReader/ThreeMFReader.py b/plugins/3MFReader/ThreeMFReader.py
index 2e3f5630c1..6bd920e38d 100755
--- a/plugins/3MFReader/ThreeMFReader.py
+++ b/plugins/3MFReader/ThreeMFReader.py
@@ -51,6 +51,10 @@ class ThreeMFReader(MeshReader):
         self._root = None
         self._base_name = ""
         self._unit = None
+        self._empty_project = False
+
+    def emptyFileHintSet(self) -> bool:
+        return self._empty_project
 
     def _createMatrixFromTransformationString(self, transformation: str) -> Matrix:
         if transformation == "":
@@ -257,6 +261,9 @@ class ThreeMFReader(MeshReader):
 
                 result.append(um_node)
 
+            if len(result) == 0:
+                self._empty_project = True
+
         except Exception:
             Logger.logException("e", "An exception occurred in 3mf reader.")
             return []