Fix crash when upgrading from 0.68.6 or lower to 0.72.0 or higher

[ukcasso]

Summary

1. Preventing crashes when version files contain empty usefulContent.
2. update 0.72 file in releases folder.

Test Plan

1. select current react-native versions below 0.68.6.
2. select upgrade 0.72.0 or higher version.
3. click 'Show me how to upgrade!' button.
4. web is crushed.

[ukcasso]

The usefulContent inside the a src/releases/react-native/0.72.js file seems to be more familiar to you.

[pvinis]

I see checks failing but if they pass we can merge. anyone with permissions.

[ukcasso]

thanks, @pvinis I'll wait until merged.

[ukcasso]

I canceled your approval due to my mistake. I would appreciate it if you could do it again. @pvinis.

[pvinis]

is your change just the if? is the other one accidental? this was there, right?

[ukcasso]

The cause of the crash is the 0.72.js file. The change in the usefulLinks.js file is again to prevent the web from being crushed by accidentally emptying the usefulContent in the release file.. :)

[ukcasso]

@pvinis , I solved the prettier problem.