Dropdown showClear not always displayed

[majugurci]

I'm submitting a ...

[x] bug report
[ ] feature request
[ ] support request

Codesandbox Case (Bug Reports)
https://codesandbox.io/s/o7z1jvy069

Current behavior
When dropdown value is 0 or false showClear icon is not displayed.

Expected behavior
Icon should be displayed.

I think the problem is code which decides should it display the icon or not.
this.props.value
This condition must be the problem.

renderClearIcon() {
        if(this.props.value && this.props.showClear && !this.props.disabled) {
            return (
                <i className="p-dropdown-clear-icon pi pi-times" onClick={this.clear}></i>
            );
        }
        else {
            return null;
        }
    }