fix(internal/gapicgen): only open draft PR if there are genproto chan…

…ges (#2634)

internal/gapicgen/cmd/genbot/github.go

@@ -240,8 +240,10 @@ func (gc *GithubClient) CreateGocloudPR(ctx context.Context, gocloudDir string,
 	log.Println("creating google-cloud-go PR")
 
 	var body string
+	var draft bool
 	if genprotoPRNum > 0 {
 		body = gocloudCommitBody + fmt.Sprintf("\n\nCorresponding genproto PR: https://github.com/googleapis/go-genproto/pull/%d\n", genprotoPRNum)
+		draft = true
 	} else {
 		body = gocloudCommitBody + "\n\nThere is no corresponding genproto PR.\n"
 	}
@@ -280,7 +282,7 @@ git push origin $BRANCH_NAME
 		Body:  &body,
 		Head:  github.String(fmt.Sprintf("googleapis:" + gocloudBranchName)),
 		Base:  github.String("master"),
-		Draft: github.Bool(true),
+		Draft: github.Bool(draft),
 	})
 	if err != nil {
 		return 0, err