fix: empty map assignment

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 21.41%. Comparing base (cef1874) to head (9f52395). Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/eni/crdv2.go	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #708 +/- ## ========================================== - Coverage 21.41% 21.41% -0.01% ========================================== Files 119 119 Lines 15542 15544 +2 ========================================== Hits 3328 3328 - Misses 11838 11840 +2 Partials 376 376 ``` | [Flag](https://app.codecov.io/gh/AliyunContainerService/terway/pull/708/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AliyunContainerService) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/AliyunContainerService/terway/pull/708/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AliyunContainerService) | `21.41% <0.00%> (-0.01%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=AliyunContainerService#carryforward-flags-in-the-pull-request-comment) to find out more.

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.