Fix Humming CP DeepEP empty-token path

[huangzhilin-hzl]

Motivation

Modifications

Accuracy Tests

Speed Tests and Profiling

Checklist

• Format your code according to the Format code with pre-commit.
• Add unit tests according to the Run and add unit tests.
• Update documentation according to Write documentations.
• Provide accuracy and speed benchmark results according to Test the accuracy and Benchmark the speed.
• Follow the SGLang code style guidance.

Review and Merge Process

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3. Trigger CI tests with comments or contact authorized users to do so.
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4. After green CI and required approvals, ask Merge Oncalls or people with Write permission to merge the PR.