fix(grpc): empty message cannot be unframed #10836
Merged
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Summary
We found an issue when testing the fix of #10801. When a service responds with a message with all default value fields, the JSON response would be totally empty.
The reason for this issue is that we assume a message to be at least of length 1 when unframing.
Removing this restriction (a message can be of length 0) fixes this issue.
Checklist
There is a user-facing docs PR against https://github.com/Kong/docs.konghq.com - PUT DOCS PR HEREIssue reference
Fix FTI-5054
Fix #10802