[Enhancement] Possible null pointer dereference due to return value of called method [SubScribeTask]

[Vip-Augus]

Search before asking

• I had searched in the issues and found no similar issues.

Enhancement Request

located at:
org/apache/eventmesh/connector/standalone/broker/task/SubScribeTask.java line 61
Add NPE to check for exceptions.

Describe the solution you'd like

Add type check before convert

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[github-actions]

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