Fix module integration

NewEvent() doesn't return Modules as nil, which was preventing this integration from working.
The extra flag was added to prevent repeatedly trying to cache the modules if getModules() returned nil.

integrations.go

@@ -19,6 +19,7 @@ import (
 type modulesIntegration struct{}
 
 var _modulesCache map[string]string // nolint: gochecknoglobals
+var _modulesCached bool             // nolint: gochecknoglobals
 
 func (mi *modulesIntegration) Name() string {
 	return "Modules"
@@ -29,18 +30,19 @@ func (mi *modulesIntegration) SetupOnce(client *Client) {
 }
 
 func (mi *modulesIntegration) processor(event *Event, hint *EventHint) *Event {
-	if event.Modules == nil {
+	if len(event.Modules) == 0 {
 		event.Modules = extractModules()
 	}
 
 	return event
 }
 
 func extractModules() map[string]string {
-	if _modulesCache != nil {
+	if _modulesCached {
 		return _modulesCache
 	}
 
+	_modulesCached = true
 	extractedModules, err := getModules()
 	if err != nil {
 		Logger.Printf("ModuleIntegration wasn't able to extract modules: %v\n", err)