Fix panic for empty tasks

Closes #338
Closes #362

Co-authored-by: Bharath Kumar <shettybharath4@gmail.com>

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Changelog
 
+## Unreleased
+
+- Fix panic when you have empty tasks in your Taskfile
+  ([#338](https://github.com/go-task/task/issues/338), [#362](https://github.com/go-task/task/pull/362)).
+
 ## v3.0.0
 
 - On `v3`, all CLI variables will be considered global variables

task_test.go

@@ -56,6 +56,16 @@ func (fct fileContentTest) Run(t *testing.T) {
 	}
 }
 
+func TestEmptyTask(t *testing.T) {
+	e := &task.Executor{
+		Dir:    "testdata/empty_task",
+		Stdout: ioutil.Discard,
+		Stderr: ioutil.Discard,
+	}
+	assert.NoError(t, e.Setup(), "e.Setup()")
+	assert.NoError(t, e.Run(context.Background(), taskfile.Call{Task: "default"}))
+}
+
 func TestEnv(t *testing.T) {
 	tt := fileContentTest{
 		Dir:       "testdata/env",

taskfile/read/taskfile.go

@@ -119,6 +119,10 @@ func Taskfile(dir string, entrypoint string) (*taskfile.Taskfile, error) {
 	}
 
 	for name, task := range t.Tasks {
+		if task == nil {
+			task = &taskfile.Task{}
+			t.Tasks[name] = task
+		}
 		task.Task = name
 	}
 

testdata/empty_task/Taskfile.yml

@@ -0,0 +1,4 @@
+version: '3'
+
+tasks:
+  default: