v0.15.4 upgrade "broke" automated tasks

[stavros-k]

Server Info (please complete the following information):

• OS: [e.g. Ubuntu 20.04, Debian 10]
• Browser: [e.g. chrome, safari]
• RMM Version (as shown in top left of web UI):

Installation Method:

• Standard
• Docker

Agent Info (please complete the following information):

• Agent version (as shown in the 'Summary' tab of the agent from web UI):
• Agent OS: [e.g. Win 10 v2004, Server 2012 R2]

Describe the bug
Automated tasks show empty env vars ( ) instead of []
Because of that tasks do not execute and result in a 500 status code.

Top: how it was after upgrade
Bottom: How it it after re-adding

More detailed info in https://discord.com/channels/736478043522072608/1050090372719718411

To Reproduce
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4. See error

Expected behavior
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[stavros-k]

Note: This is only an issue on the previously created tasks, not new!

For now I solved the issue, by editing each task adding the script again and removing the old entry

New tasks works fine

[wh1te909]

thank you, fixed in 0.15.5 I added a migration for older tasks to get them into the newer format