fix: attribute integer not working (opentibiabr#854)

The "is_integral" was not working, causing integer attributes not to be read.

Complement of commit: opentibiabr@46b2c5e

src/items/functions/item/custom_attribute.hpp

@@ -32,16 +32,14 @@ class CustomAttribute {
 				return getDouble();
 			} else if constexpr (std::is_same_v<T, bool>) {
 				return getBool();
-			} else if constexpr (std::is_integral_v<T>) {
+			} else {
 				return std::clamp(
 					static_cast<T>(getInteger()),
 					std::numeric_limits<T>::min(),
 					std::numeric_limits<T>::max()
 				);
-			} else {
-				SPDLOG_ERROR("[{}] not found value", __FUNCTION__);
 			}
-			return T();
+			return {};
 		}
 
 		const int64_t &getInteger() const;

src/items/item.h

@@ -38,14 +38,14 @@ class ItemProperties {
 		T getAttribute(ItemAttribute_t type) const {
 			if constexpr (std::is_same_v<T, std::string>) {
 				return getString(type);
-			} else if constexpr (std::is_integral_v<T>) {
+			} else {
 				return std::clamp(
 					static_cast<T>(getInteger(type)),
 					std::numeric_limits<T>::min(),
 					std::numeric_limits<T>::max()
 				);
 			}
-			return T();
+			return {};
 		}
 
 		bool hasAttribute(ItemAttribute_t type) const {