no response when we use a wrong sig label

[Rustin170506]

Bug Report

• I have searched the issues of this repository and believe that this is not a duplicate.

Related link

None

Steps to reproduce(Optional)

Add a wrong sig label for issue.

What is expected?

It can be reported.

What is actually happening?

Nothing.

[asuka730]

I think it might be caused by typeorm query. We get a crash when the table join query could not build.

index.ts#L124

    // FIXME: now we use lower case sig label name, maybe we should fix it on github.
    const { sigId } = await this.githubLabelSigRepository
      .createQueryBuilder("gls")
      .leftJoinAndSelect(
        ProjectSig,
        "ps",
        "ps.project_sig_id = gls.project_sig_id"
      )
      .where(`gls.label = '${sigLabelName}'`)
      .select("ps.sig_id", "sigId")
      .getRawOne();

And returns with crashing.

[ti-chi-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
If this issue is safe to close now please do so with /close.
Send feedback to sig-community-infra or hi-rustin.
/lifecycle stale

[ti-chi-bot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close.
Send feedback to sig-community-infra or hi-rustin.
/lifecycle rotten