Fix Bug on Events Configuration Equal function

If Config.Events was nil, it would cause an null pointer exception

pkg/notification/notification.go

@@ -180,20 +180,28 @@ func EqualFilterRuleList(a, b []FilterRule) bool {
 
 // Equal returns whether this `Config` is equal to another defined by the passed parameters
 func (t *Config) Equal(events []EventType, prefix, suffix string) bool {
-	//Compare events
+	if t == nil {
+		return false
+	}
+
+	// Compare events
 	passEvents := EqualEventTypeList(t.Events, events)
 
-	//Compare filters
-	var newFilter []FilterRule
+	// Compare filters
+	var newFilterRules []FilterRule
 	if prefix != "" {
-		newFilter = append(newFilter, FilterRule{Name: "prefix", Value: prefix})
+		newFilterRules = append(newFilterRules, FilterRule{Name: "prefix", Value: prefix})
 	}
 	if suffix != "" {
-		newFilter = append(newFilter, FilterRule{Name: "suffix", Value: suffix})
+		newFilterRules = append(newFilterRules, FilterRule{Name: "suffix", Value: suffix})
+	}
+
+	var currentFilterRules []FilterRule
+	if t.Filter != nil {
+		currentFilterRules = t.Filter.S3Key.FilterRules
 	}
 
-	passFilters := EqualFilterRuleList(t.Filter.S3Key.FilterRules, newFilter)
-	// if it matches events and filters, mark the index for deletion
+	passFilters := EqualFilterRuleList(currentFilterRules, newFilterRules)
 	return passEvents && passFilters
 }