Hxssssss opened a new pull request #4457:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/4457
## What is the purpose of the pull request
fix the exception of update null point of workflow instance due to not add
global parameter when create workflow definition
## Brief change logu
use Optional to process the globalparamlist object. If it is empty, an
empty ArrayList will be returned
## Verify this pull request
This pull request is already covered by existing tests.
After the repair, if globalparamlist is empty, it will be replaced by an
empty ArrayList, and the workflow instance will be saved successfully
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