Fix behaviour when error occurs

main.go

@@ -67,6 +67,7 @@ func main() {
 	ctx, err := githubactions.Context()
 	if err != nil {
 		githubactions.Fatalf("could not get context: %v", err.Error())
+		return
 	}
 
 	token := os.Getenv("GITHUB_TOKEN")
@@ -75,18 +76,16 @@ func main() {
 	config, err := ParseActionConfig(*ctx)
 	if err != nil {
 		githubactions.Fatalf("%v", err.Error())
+		return
 	}
 
 	pr, err := createPullRequest(ctx.ServerURL, token, *config)
 	if err != nil {
 		githubactions.Fatalf("Error while creating pr: %v", err.Error())
+		return
 	}
 
-	if pr != nil {
-		fmt.Printf("Created PR with id %d\n", pr.ID)
-	} else {
-		fmt.Printf("No PR created\n")
-	}
+	fmt.Printf("Created PR with id %d\n", pr.ID)
 
 	githubactions.SetOutput("pull-request-number", strconv.FormatInt(pr.Index, 10))
 	githubactions.SetOutput("pull-request-url", pr.URL)
@@ -234,7 +233,7 @@ func createPullRequest(apiUrl string, token string, config CreatePrConfig) (*git
 	}
 
 	if has {
-		return nil, nil
+		return nil, errors.New("PR already exists for this head branch")
 	}
 
 	pr, err := agent.createPullRequestGitea(config)