fix: panic at empty http spec

[basuotian]

Signed-off-by: Basuotian basuoluomiu@gmail.com

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches
• Documentation
• Refactor
• Chore
• CI/CD or Tests

What this PR does / why we need it:

Fix: #1659

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[basuotian]

@tao12345666333 PTAL, thx

[codecov-commenter]

Codecov Report

Merging #1660 (63987d2) into master (84d11a1) will decrease coverage by 0.09%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #1660      +/-   ##
==========================================
- Coverage   41.09%   41.01%   -0.09%     
==========================================
  Files          88       88              
  Lines        7550     7566      +16     
==========================================
  Hits         3103     3103              
- Misses       4087     4103      +16     
  Partials      360      360              

Impacted Files	Coverage Δ
pkg/providers/ingress/translation/translator.go	0.00% <0.00%> (ø)
pkg/providers/ingress/ingress.go	4.05% <0.00%> (-0.04%)	⬇️

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[Fabriceli]

i think this #1654 is the same situation

[tao12345666333]

Thanks

Can you create an e2e test case to cover this?

[basuotian]

@tao12345666333 add an e2e-test case for empty http spec, but i am not sure the case is expected, PTAL, thx

[basuotian]

@lingsamuel @AlinsRan first pr need one more reviewer, PTAL, thx