fix: Catch null content errors

[dcalhoun]

There are contexts where the JavaScript runtime appears to send null
values to the host app. It could be performance related, but we should
catch the errors nonetheless.

Related:

• JSONException: Value null of type org.json.JSONObject$1 cannot be converted to JSONObject GutenbergKit#74
• fix: Catch null content errors GutenbergKit#80

To Test:

I was unable to reproduce the crash, so we cannot test the fix. We can test for regressions in the form of saving title and content changes in the editor—save/update button, back button, quit app, etc.

Regression Notes

1. Potential unintended areas of impact
   None likely.
2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Testing saving title and content changes.
3. What automated tests I added (or what prevented me from doing so)
   Deemed unnecessary for the experimental feature.

PR Submission Checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

Testing Checklist (strike-out the not-applying and unnecessary ones):

• WordPress.com sites and self-hosted Jetpack sites.
• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• Talkback.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• Large and small screen sizes. (Tablet and smaller phones)
• Multi-tasking: Split screen and Pop-up view. (Android 10 or higher)

[dangermattic]

	1 Warning
⚠️	PR is not assigned to a milestone.

Generated by 🚫 Danger

[wpmobilebot]

Project dependencies changes

The following changes in project dependencies were detected (configuration wordpressVanillaReleaseRuntimeClasspath):

list

Upgraded Dependencies
org.wordpress.gutenbergkit:android:trunk-7894ff454cf2a889dd4634e031c1a0323d7f3d08, (changed from trunk-7a9a66ce400ef1baaa2d098c0f8c95ffe1f42f81)

tree

 +--- project :libs:editor
-|    \--- org.wordpress.gutenbergkit:android:trunk-7a9a66ce400ef1baaa2d098c0f8c95ffe1f42f81
+|    \--- org.wordpress.gutenbergkit:android:trunk-7894ff454cf2a889dd4634e031c1a0323d7f3d08
-\--- org.wordpress.gutenbergkit:android:trunk-7a9a66ce400ef1baaa2d098c0f8c95ffe1f42f81 (*)
+\--- org.wordpress.gutenbergkit:android:trunk-7894ff454cf2a889dd4634e031c1a0323d7f3d08 (*)

[wpmobilebot]

📲 You can test the changes from this Pull Request in WordPress by scanning the QR code below to install the corresponding build.

	App Name	WordPress
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21673-3c28b1a
	Commit	3c28b1a
	Direct Download	wordpress-prototype-build-pr21673-3c28b1a.apk

Note: Google Login is not supported on these builds.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Jetpack by scanning the QR code below to install the corresponding build.

	App Name	Jetpack
	Flavor	Jalapeno
	Build Type	Debug
	Version	pr21673-3c28b1a
	Commit	3c28b1a
	Direct Download	jetpack-prototype-build-pr21673-3c28b1a.apk

Note: Google Login is not supported on these builds.

[nbradbury]

@dcalhoun This all tested fine, merge when ready

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud