Currently in node_api_internal.h
```
#define AS_JERRY_VALUE(nvalue) (jerry_value_t)(uintptr_t) nvalue
jerry_value_t AS_JERRY_OBJECT(napi_value nvalue);
```
But in  https://github.com/nodejs/node-addon-api/blob/main/napi.h, they , when the value of
nvalue is nullptr means invalid value(empty value), not `number 0`, that's getting inconsistence
between node_api.h and jerryscript internal jerry_value_t.

Possible resolution is to define the meaning of 0 in jerry_value_t as  ECMA_VALUE_EMPTY,
```
  ECMA_VALUE_EMPTY = ECMA_MAKE_VALUE (0), /**< uninitialized value */
```
That's will get consistence meaning in jerryscript and node_api


###### JerryScript revision
b1f73e698af4b422c19c38290bb49cb434611e9e

in jerry jerry_value_t == 0 means number '0' that's incosistence with nullptr in NAPI
This is a GitHub Issue
repo:jerryscript
owner:jerryscript-project
Title : in jerry jerry_value_t == 0 means number '0' that's incosistence with nullptr in NAPI
Issue date:

--- start body ---
Currently in node_api_internal.h
```
#define AS_JERRY_VALUE(nvalue) (jerry_value_t)(uintptr_t) nvalue
jerry_value_t AS_JERRY_OBJECT(napi_value nvalue);
```
But in  https://github.com/nodejs/node-addon-api/blob/main/napi.h, they , when the value of
nvalue is nullptr means invalid value(empty value), not `number 0`, that's getting inconsistence
between node_api.h and jerryscript internal jerry_value_t.

Possible resolution is to define the meaning of 0 in jerry_value_t as  ECMA_VALUE_EMPTY,
```
  ECMA_VALUE_EMPTY = ECMA_MAKE_VALUE (0), /**< uninitialized value */
```
That's will get consistence meaning in jerryscript and node_api


###### JerryScript revision
b1f73e698af4b422c19c38290bb49cb434611e9e

--- end body ---
