Saving Project twice crashes flatcam (Beta 8.994, Linux)

[Paul G.]

Steps to reproduce:

• start Flatcam
• save Project
• save Project again (crash)

[DEBUG][Dummy-4] save_project()
WARNING: Traceback (most recent call last):
File "/mnt/store/build/flatcam3/flatcam/app_Main.py", line 9258, in on_file_saveproject
self.app.file_saved.emit("project", self.project_filename)
AttributeError: 'MenuFileHandlers' object has no attribute 'project_filename'

This second save seems to corrupt the project file, so reopening it in flatcam then gives an error:

[ERROR][MainThread] Failed to parse project file, trying to see if it loads as an LZMA archive:
/home/p/store/projekte/lasern/Project_20201030_210647.FlatPrj because Expecting value: line 1 co
lumn 1 (char 0)
[ERROR][MainThread] Failed to open project file: /home/p/store/projekte/lasern/Project_20201030_
210647.FlatPrj with error: Compressed file ended before the end-of-stream marker was reached

‌

[Marius Stanciu]

• fixed issue #457; wrong reference when saving a project

→ <<cset ffe4f0d64146>>