feat(resource-channel): prune null filters values

examples/resources/nullplatform_notification_channel/resource.tf

@@ -88,5 +88,5 @@ output "github_channel_repository" {
 }
 
 output "agent_channel_command" {
- value = nullplatform_notification_channel.custom_agent.configuration[0].agent[0].command[0].data.cmdline
+ value = nullplatform_notification_channel.agent.configuration[0].agent[0].command[0].data.cmdline
 }

nullplatform/resource_notification_channel.go

@@ -304,7 +304,11 @@ func NotificationChannelCreate(d *schema.ResourceData, m any) error {
 		if err := json.Unmarshal([]byte(v.(string)), &filtersMap); err != nil {
 			return fmt.Errorf("invalid filters JSON: %v", err)
 		}
-		newChannel.Filters = filtersMap
+		if pruned, keep := pruneNulls(filtersMap); keep {
+			newChannel.Filters = pruned.(map[string]interface{})
+		} else {
+			newChannel.Filters = make(map[string]interface{})
+		}
 	} else {
 		newChannel.Filters = make(map[string]interface{})
 	}
@@ -518,7 +522,9 @@ func NotificationChannelUpdate(d *schema.ResourceData, m any) error {
 			if err := json.Unmarshal([]byte(v.(string)), &filtersMap); err != nil {
 				return fmt.Errorf("invalid filters JSON: %v", err)
 			}
-			updateChannel.Filters = filtersMap
+			if pruned, keep := pruneNulls(filtersMap); keep {
+				updateChannel.Filters = pruned.(map[string]interface{})
+			}
 		}
 
 		if err := nullOps.UpdateNotificationChannel(d.Id(), updateChannel); err != nil {

nullplatform/utils.go

@@ -59,3 +59,36 @@ func tryParseJSON(value string) any {
 	}
 	return parsedValue
 }
+
+
+func pruneNulls(v interface{}) (interface{}, bool) {
+	switch t := v.(type) {
+	case map[string]interface{}:
+		out := make(map[string]interface{}, len(t))
+		for k, vv := range t {
+			if pruned, keep := pruneNulls(vv); keep {
+				out[k] = pruned
+			}
+		}
+		if len(out) == 0 {
+			return nil, false
+		}
+		return out, true
+	case []interface{}:
+		out := make([]interface{}, 0, len(t))
+		for _, vv := range t {
+			if pruned, keep := pruneNulls(vv); keep {
+				out = append(out, pruned)
+			}
+		}
+		if len(out) == 0 {
+			return nil, false
+		}
+		return out, true
+	default:
+		if t == nil {
+			return nil, false
+		}
+		return t, true
+	}
+}