"Incenteev\ParameterHandler\ScriptHandler::buildParameters",

"incenteev/composer-parameter-handler": "~2.0",

...

"incenteev-parameters": {
    "file": "app/config/parameters.yml"
},

[...]
"extra": {
    "symfony-app-dir": "app",
    "symfony-web-dir": "web",
    "incenteev-parameters": {
        "file": "app/config/parameters.yml",
        "keep-outdated": true  <------------ ADDED LINE ------------
    },
    "branch-alias": {
        "dev-master": "2.3-dev"
    },
    "symfony-assets-install": "symlink"
}
[...]

# app/config/parameter.yml.dist
parameters:
    database_driver:   pdo_sqlite
    database_host:     ~
    database_port:     ~
    database_name:     ~
    database_user:     ~
    database_password: ~
    database_path:     ~ <------------ ADDED LINE ------------
    database_memory:   ~ <------------ ADDED LINE ------------
[...]

"incenteev-parameters": {
    "file": "app/config/parameters.yml"
},

"incenteev-parameters": {},

"incenteev-parameters": {
    "file": "app/config/parameters.yml",
    "keep-outdated": true
},