fix: fail if no pipelines are configured

internal/root_runner/run.go

@@ -62,6 +62,10 @@ func (runner *Runner) Run(options RunnerOptions, args ...string) error {
 		pipelines = append(pipelines, prPipe)
 	}
 
+	if len(pipelines) == 0 {
+		return errors.New("no pipelines defined")
+	}
+
 	result := dispatch.RunPipelines(pipelines)
 
 	if len(result.Errors) != 0 {

internal/root_runner/run_test.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/apex/log"
 	"github.com/apex/log/handlers/memory"
+	"github.com/spf13/viper"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -73,3 +74,20 @@ func TestFromToCommits(t *testing.T) {
 
 	assert.NoError(t, err)
 }
+
+func TestMissingPipelines(t *testing.T) {
+	handler := memory.New()
+
+	log.SetHandler(handler)
+
+	runner := Runner{}
+
+	viper.Set("commits.disabled", true)
+
+	err := runner.Run(RunnerOptions{})
+
+	assert.Error(t, err)
+	assert.Equal(t, "no pipelines defined", err.Error())
+
+	viper.Set("commits.disabled", "")
+}