try this code:
if( get_theme_mod('your_setting_name') ){
//your code
}else{
//your code
}
Note: get_theme_mod() return false if no value exist for your setting
try this code:
if( get_theme_mod('your_setting_name') ){
//your code
}else{
//your code
}
Note: get_theme_mod() return false if no value exist for your setting