feat(microservices): Added invalid-grpc-message-decorator.exception.ts

[PhilipMantrov]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

TypeError: Cannot read properties of undefined (reading 'value')

Issue Number: N/A

What is the new behavior?

InvalidGrpcDecoratorException[Error]: The invalid gRPC decorator (method "methodName" in service "serviceName")

Does this PR introduce a breaking change?

• Yes
• No

[coveralls]

Pull Request Test Coverage Report for Build a576ccfd-5015-47fa-9a69-79f0a6da3363

• 9 of 11 (81.82%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.02%) to 92.725%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/microservices/decorators/message-pattern.decorator.ts	7	8	87.5%
packages/microservices/errors/invalid-grpc-message-decorator.exception.ts	2	3	66.67%

Totals
Change from base Build 58e5c8f8-e60b-4fc4-aa73-86b16586db9a:	-0.02%
Covered Lines:	6398
Relevant Lines:	6900

---

💛 - Coveralls

[kamilmysliwiec]

Could you provide us with a minimum reproduction repository/snippet?

[PhilipMantrov]

example repo

without this fix (just yarn start)

var decorated = decorator(target);
                                ^
TypeError: Cannot read properties of undefined (reading 'value')

with this fix (after yarn cp_pr)

 var decorated = decorator(target);
                                ^
Error: The invalid gRPC decorator (method "testMethod" in service "TestService")

[PhilipMantrov]

bump

[kamilmysliwiec]

lgtm