zhuangchong opened a new pull request #4569:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/4569
## What is the purpose of the pull request
this PR closes #4568
When the workflow definition name validation API fails, the system prompts
that the workflow definition name already exists,
the system normally prompts workflow definition name validation error
## Verify this pull request
This change added tests and can be verified as follows:
- *Manually verified the change by testing locally.*
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