Generate a correct yaml when properties are empty

Author: MatteoPologruto

commands/service_profile_init.go

@@ -46,7 +46,7 @@ func (s *arduinoCoreServerImpl) InitProfile(ctx context.Context, req *rpc.InitPr
 	}
 
 	if !projectFilePath.Exist() {
-		err := projectFilePath.WriteFile([]byte("profiles:\n"))
+		err := projectFilePath.WriteFile([]byte("profiles: {}\n"))
 		if err != nil {
 			return nil, err
 		}

internal/arduino/sketch/profiles.go

@@ -189,6 +189,9 @@ type ProfileRequiredPlatforms []*ProfilePlatformReference
 
 // AsYaml outputs the required platforms as Yaml
 func (p *ProfileRequiredPlatforms) AsYaml() string {
+	if len(*p) == 0 {
+		return "    platforms: []\n"
+	}
 	res := "    platforms:\n"
 	for _, platform := range *p {
 		res += platform.AsYaml()
@@ -202,6 +205,9 @@ type ProfileRequiredLibraries []*ProfileLibraryReference
 
 // AsYaml outputs the required libraries as Yaml
 func (p *ProfileRequiredLibraries) AsYaml() string {
+	if len(*p) == 0 {
+		return "    libraries: []\n"
+	}
 	res := "    libraries:\n"
 	for _, lib := range *p {
 		res += lib.AsYaml()

internal/integrationtest/profiles/profiles_test.go

@@ -184,7 +184,7 @@ func initNoProfile(t *testing.T, env *integrationtest.Environment, cli *integrat
 	require.FileExists(t, projectFile.String())
 	fileContent, err := projectFile.ReadFile()
 	require.NoError(t, err)
-	require.Equal(t, "profiles:\n", string(fileContent))
+	require.Equal(t, "profiles: {}\n", string(fileContent))
 }
 
 func initWithCorrectFqbn(t *testing.T, env *integrationtest.Environment, cli *integrationtest.ArduinoCLI) {
@@ -195,7 +195,7 @@ func initWithCorrectFqbn(t *testing.T, env *integrationtest.Environment, cli *in
 	require.FileExists(t, projectFile.String())
 	fileContent, err := projectFile.ReadFile()
 	require.NoError(t, err)
-	require.Equal(t, "profiles:\n  Uno:\n    fqbn: arduino:avr:uno\n    platforms:\n      - platform: arduino:avr (1.8.6)\n    libraries:\n\ndefault_profile: Uno\n", string(fileContent))
+	require.Equal(t, "profiles:\n  Uno:\n    fqbn: arduino:avr:uno\n    platforms:\n      - platform: arduino:avr (1.8.6)\n    libraries: []\n\ndefault_profile: Uno\n", string(fileContent))
 }
 
 func initWithWrongFqbn(t *testing.T, env *integrationtest.Environment, cli *integrationtest.ArduinoCLI) {
@@ -315,7 +315,7 @@ func removeLibFromDefaultProfile(t *testing.T, env *integrationtest.Environment,
 	require.NoError(t, err)
 	fileContent, err := cli.SketchbookDir().Join("Simple", "sketch.yaml").ReadFile()
 	require.NoError(t, err)
-	require.Equal(t, "profiles:\n  Uno:\n    fqbn: arduino:avr:uno\n    platforms:\n      - platform: arduino:avr (1.8.6)\n    libraries:\n\ndefault_profile: Uno\n", string(fileContent))
+	require.Equal(t, "profiles:\n  Uno:\n    fqbn: arduino:avr:uno\n    platforms:\n      - platform: arduino:avr (1.8.6)\n    libraries: []\n\ndefault_profile: Uno\n", string(fileContent))
 }
 
 func addInexistentLibToDefaultProfile(t *testing.T, env *integrationtest.Environment, cli *integrationtest.ArduinoCLI) {