Valid condition in blade form input

How to make valid condition for value tag in laravel 5.7 if field was modified and we have to show new value if field was modified ? I tried like that with required condition :

(old('common_settings_site_name') ? old('common_settings_site_name') : ( isset($common_settings_site_name) ?$common_settings_site_name : '' ) ),

it is good, bur not n case when field with existing value was cleared, then original value(not old - clear) is shown.

Like text field had some text “Value” The field was cleared. submitting form original field would be shown not empty string as I exepected ? How to fix it ?

Thanks!

via Chebli Mohamed