[MM-62537] Fix: Integration action nil ptr dereference (#29986)

* guard against nil dereference; lock down with tests

* fix test name

server/public/model/integration_action.go

@@ -466,7 +466,7 @@ func isDefaultInOptions(defaultValue string, options []*PostActionOptions) bool
 	}
 
 	for _, option := range options {
-		if defaultValue == option.Value {
+		if option != nil && defaultValue == option.Value {
 			return true
 		}
 	}

server/public/model/integration_action_test.go

@@ -322,6 +322,22 @@ func TestOpenDialogRequestIsValid(t *testing.T) {
 		assert.ErrorContains(t, err, "invalid data source")
 	})
 
+	t.Run("should fail on wrong select default value, and not fail with nil dereference", func(t *testing.T) {
+		request := getBaseOpenDialogRequest()
+		request.Dialog.Elements = append(request.Dialog.Elements, DialogElement{
+			DisplayName: "Select element name",
+			Name:        "select_element_name",
+			Type:        "select",
+			DataSource:  "",
+			Default:     "default",
+			Options: []*PostActionOptions{
+				nil,
+			},
+		})
+		err := request.IsValid()
+		assert.ErrorContains(t, err, "default value \"default\" doesn't exist in options")
+	})
+
 	t.Run("should fail on wrong radio default value", func(t *testing.T) {
 		request := getBaseOpenDialogRequest()
 		request.Dialog.Elements = append(request.Dialog.Elements, DialogElement{
@@ -339,6 +355,20 @@ func TestOpenDialogRequestIsValid(t *testing.T) {
 		err := request.IsValid()
 		assert.ErrorContains(t, err, "default value \"default\" doesn't exist in options")
 	})
+	t.Run("should fail on wrong radio default value, and not fail with nil dereference", func(t *testing.T) {
+		request := getBaseOpenDialogRequest()
+		request.Dialog.Elements = append(request.Dialog.Elements, DialogElement{
+			DisplayName: "Radio element name",
+			Name:        "radio_element_name",
+			Type:        "radio",
+			Default:     "default",
+			Options: []*PostActionOptions{
+				nil,
+			},
+		})
+		err := request.IsValid()
+		assert.ErrorContains(t, err, "default value \"default\" doesn't exist in options")
+	})
 	t.Run("should pass radio default value", func(t *testing.T) {
 		request := getBaseOpenDialogRequest()
 		request.Dialog.Elements = append(request.Dialog.Elements, DialogElement{