fix during token login error in kubeedge version 1.19.1

[ryan-jay-qiu]

…s empty during token login in kubeedge version 1.19.1

What type of PR is this?
/kind bug

What this PR does / why we need it:

When logging into the dashboard with kubeedge version 1.91.1, an error occurs and the system cannot be accessed. It is possible that the version is not compatible, so please fix it

Which issue(s) this PR fixes:

Fixes #
fix:Resolve the issue of the getServiceAccountName function parsing as empty during token login in kubeedge version 1.19.1
Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[kubeedge-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kubeedge-bot]

Welcome @ryan-jay-qiu! It looks like this is your first PR to kubeedge/dashboard 🎉

[ryan-jay-qiu]

@kevin-wangzefeng @vincentgoat

[wbc6080]

PTAL @ghosind

[ghosind]

/lgtm

[kubeedge-bot]

@ryan-jay-qiu: PR needs rebase.

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