tests: fix regression in close test

Author: feywind

testproxy/services/read-row.ts

@@ -49,7 +49,7 @@ export const readRow: ClientImplMaker<IReadRowRequest, IRowResult> = ({
       const error = e as GoogleError;
       return {
         status: {
-          code: error.code,
+          code: error.code || grpc.status.FAILED_PRECONDITION,
           // e.details must be in an empty array for the test runner to return the status. This is tracked in b/383096533.
           details: [],
           message: error.message,

testproxy/services/read-rows.ts

@@ -87,7 +87,7 @@ export const readRows: ClientImplMaker<IReadRowsRequest, IRowsResult> = ({
       const error = e as GoogleError;
       return {
         status: {
-          code: error.code,
+          code: error.code || grpc.status.FAILED_PRECONDITION,
           // e.details must be in an empty array for the test runner to return the status. This is tracked in b/383096533.
           details: [],
           message: error.message,