TiDB Dashboard cannot start with default cli args

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Bug Report

Please answer these questions before submitting your issue. Thanks!

What did you do?

$ bin/tidb-dashboard

What did you expect to see?

TiDB Dashboard UI works

What did you see instead?

UI cannot work, always showing "Error: Invalid Semantic Version".

What version of TiDB Dashboard are you using (./tidb-dashboard --version)?

master