fix: editing a Service, the upstream info will be lost.

[guoqqqi]

Please answer these questions before submitting a pull request

• Why submit this pull request?

• Bugfix

• New feature provided

• Improve performance

• Backport patches

• Related issues
  resolve after editing a Service, the upstream info will be lost. #1299

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Bugfix

• How to fix?
  Change condition upstreamFormData.upstream_id === ‘ ’ to !upstreamFormData.upstream_id

[codecov-io]

Codecov Report

Merging #1347 (8b5dfec) into master (6d7f11a) will decrease coverage by 13.86%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #1347       +/-   ##
===========================================
- Coverage   62.79%   48.93%   -13.87%     
===========================================
  Files          41       41               
  Lines        2352     2352               
===========================================
- Hits         1477     1151      -326     
- Misses        700     1008      +308     
- Partials      175      193       +18     

Impacted Files	Coverage Δ
api/internal/core/store/query.go	0.00% <0.00%> (-88.10%)	⬇️
api/internal/utils/consts/api_error.go	17.39% <0.00%> (-78.27%)	⬇️
api/internal/core/store/selector.go	0.00% <0.00%> (-75.93%)	⬇️
api/internal/handler/plugin/plugin.go	16.66% <0.00%> (-70.00%)	⬇️
api/internal/core/store/validate_mock.go	0.00% <0.00%> (-50.00%)	⬇️
api/internal/filter/authentication.go	44.11% <0.00%> (-32.36%)	⬇️
api/internal/core/store/store.go	59.37% <0.00%> (-28.75%)	⬇️
api/internal/handler/global_rule/global_rule.go	62.71% <0.00%> (-20.34%)	⬇️
api/internal/handler/consumer/consumer.go	74.46% <0.00%> (-17.03%)	⬇️
api/internal/handler/route/route.go	50.43% <0.00%> (-16.96%)	⬇️
... and 11 more

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