Execute flow doesn't work when there's no override config set #5177
Description
Describe the bug
With the worlds most simply execute agent flow, you will get an error:
"Error: predictionsServices.buildChatflow - Cannot create property 'startState' on string ''"
This is because the overrideConfig, when not on the agent flow, is being sent as an empty string:
url: 'http://localhost:3000/api/v1/prediction/36afac37-0c6c-4b79-9465-06657a3c8db7',
data: '{"question":"test","chatId":"9f9534df-08f3-467f-ba6f-f9a319ab3303","overrideConfig":""}',
To Reproduce
Expected behavior
It to work :D
Screenshots
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Flow
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Use Method
None
Flowise Version
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Operating System
None
Browser
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Additional context
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