Fix bug: integer cannot be null (#496)

* Fix bug: integer cannot be null

* Refactor method name

generator/src/main/java/line/bot/generator/pebble/IsOmitEmptyFunction.java

@@ -38,9 +38,18 @@ public Object execute(Map<String, Object> args, PebbleTemplate self, EvaluationC
             // such as imageBackgroundColor in ButtonsTemplate.
             return true;
         }
+        if (var.isInteger && isGreaterThanZero(var.minimum)) {
+            // For optional integer types with a minimum value greater than 0,
+            // it's acceptable to treat 0 as a null value
+            return true;
+        }
         if (var.isPrimitiveType) {
             return false;
         }
         return true;
     }
+
+    private boolean isGreaterThanZero(String val) {
+        return val != null && Integer.parseInt(val) > 0;
+    }
 }

linebot/messaging_api/model_limit.go

@@ -28,7 +28,7 @@ type Limit struct {
 	 * The maximum number of narrowcast messages to send. Use this parameter to limit the number of narrowcast messages sent. The recipients will be chosen at random.
 	 * minimum: 1
 	 */
-	Max int32 `json:"max"`
+	Max int32 `json:"max,omitempty"`
 
 	/**
 	 * If true, the message will be sent within the maximum number of deliverable messages. The default value is `false`.  Targets will be selected at random.

linebot/messaging_api/model_show_loading_animation_request.go

@@ -34,5 +34,5 @@ type ShowLoadingAnimationRequest struct {
 	 * minimum: 5
 	 * maximum: 60
 	 */
-	LoadingSeconds int32 `json:"loadingSeconds"`
+	LoadingSeconds int32 `json:"loadingSeconds,omitempty"`
 }