BUG: flows dashboard and quickrun throw errors when enabling a schedule when no schedules exist

[dylanraithel]

Bug Description

This is more of a user experience gap than a pure bug. The graphql response in the browser indicates a server failure when attempting to enable or disable a flowrun schedule if there's no schedule for the flow. Once a schedule exists, toggling schedules on/off works as expected

Steps To Reproduce

1. Create a project
2. Regiser a flow
3. *Make sure no schedules exist
4. Go to the flows dashboard or quickrun screen and toggle the schedule on or off

Browsers Tested:

• Chrome
• Firefox
• Safari
• Edge
• IE

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Notes

[{ "data": { "set_schedule_active": { "success": false, "__typename": "success_payload" } } }]

[kvnkho]

At the minimum, the request here is a warning message to check if a schedule is properly set.

[ShaoyiZhang]

I encountered this misleading error message as well and was scratching my head. +1 for a clearer warning message.