fix: prevent crash on invalid URI during JSON import (#561)

[khushthecoder]

This PR fixes issue #561.

The JSON import flow was crashing because the default uri format validator inside jsonschema throws a TypeError when given an empty string or a non-URL-safe value.

This patch adds a safe custom URI validator (safeUriValidator) and overrides the built-in uri format.
It allows empty strings, trims input, and returns false instead of throwing — preventing the app from crashing.

Tested locally:
✓ Export JSON
✓ Re-import JSON in a fresh editor tab
✓ No errors, import works correctly

Thanks!

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[1ilit]

@khushthecoder can u please provide a diagram where the error occurs

[khushthecoder]

@khushthecoder can u please provide a diagram where the error occurs

sure will do it in a few moments

[khushthecoder]

Hi @L1lit, As requested, I've successfully reproduced the original bug on my local machine. I ran the code from the upstream/main branch (on the bug-repro-branch) and imported the original .json file from issue #561. Here is the screenshot of the console crash (TypeError: Invalid URL). My PR correctly handles this exact error and prevents the app from crashing.

[1ilit]

please export the diagram as json and attach it here