Reviewed-on: https://dev.tt-rss.org/fox/tt-rss/pulls/77

Merge pull request 'Handle no response body, file_get_contents() failure in UrlHelper::fetch()' (#78) from wn/tt-rss:feature/handle-no-response-body into master

Reviewed-on: https://dev.tt-rss.org/fox/tt-rss/pulls/78

This isn't supported for arrays with string keys until PHP 8.1.

https://wiki.php.net/rfc/spread_operator_for_array

This reverts commit 6a68ed02.

 * allow plugins to inject JS code into login form

Merge pull request 'Fix an error when disabling all user plugins' (#76) from yan12125/tt-rss:fix-setPlugins-error into master

Reviewed-on: https://dev.tt-rss.org/fox/tt-rss/pulls/76

If I enabled some user plugins via Preferences -> Plugins and then
disabled all of them, an error occurred:

Jul 16 22:34:20 php[100]: PHP Fatal error:  Uncaught TypeError: array_filter(): Argument #1 ($array) must be of type array, null given in /usr/share/webapps/tt-rss/classes/pref/prefs.php:1027
Jul 16 22:34:20 php[100]: Stack trace:
Jul 16 22:34:20 php[100]: #0 /usr/share/webapps/tt-rss/classes/pref/prefs.php(1027): array_filter()
Jul 16 22:34:20 php[100]: #1 /usr/share/webapps/tt-rss/backend.php(136): Pref_Prefs->setplugins()
Jul 16 22:34:20 php[100]: #2 {main}
Jul 16 22:34:20 php[100]:   thrown in /usr/share/webapps/tt-rss/classes/pref/prefs.php on line 1027

Apparently the issue was elevated from a warning to an error in PHP 8.0
[1].

[1] https://php.watch/versions/8.0/internal-function-exceptions

By running the following command after updating composer.json

```
composer update chillerlan/php-qrcode chillerlan/php-settings-container
```

This change fixes a deprecation warning from Preferences ->
Personal data / Authentication -> Authenticator (OTP).

```
Return type of chillerlan\Settings\SettingsContainerAbstract::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice
1. vendor/chillerlan/php-settings-container/src/SettingsContainerAbstract.php(19): ttrss_error_handler(Return type of chillerlan\Settings\SettingsContainerAbstract::jsonSerialize() should either be compatible with JsonSerializable::jsonSerialize(): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice, vendor/chillerlan/php-settings-container/src/SettingsContainerAbstract.php)
2. vendor/composer/ClassLoader.php(571): include(/usr/share/webapps/tt-rss/vendor/chillerlan/php-settings-container/src/SettingsContainerAbstract.php)
3. vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile(/usr/share/webapps/tt-rss/vendor/composer/../chillerlan/php-settings-container/src/SettingsContainerAbstract.php)
4. vendor/chillerlan/php-qrcode/src/QROptions.php(59): loadClass(chillerlan\Settings\SettingsContainerAbstract)
5. vendor/composer/ClassLoader.php(571): include(/usr/share/webapps/tt-rss/vendor/chillerlan/php-qrcode/src/QROptions.php)
6. vendor/composer/ClassLoader.php(428): Composer\Autoload\includeFile(/usr/share/webapps/tt-rss/vendor/composer/../chillerlan/php-qrcode/src/QROptions.php)
7. vendor/chillerlan/php-qrcode/src/QRCode.php(113): loadClass(chillerlan\QRCode\QROptions)
8. classes/pref/prefs.php(958): __construct()
9. classes/pref/prefs.php(469): _get_otp_qrcode_img()
10. classes/pref/prefs.php(541): index_auth_2fa()
11. backend.php(136): index_auth()
```

The issue is fixed in php-settings-container 2.1.1 [1] Here I use the
latest php-qrcode version for another PHP 8.1 fix [2].

[1] https://github.com/chillerlan/php-settings-container/commit/68bc5019c8b38956c83906431ef879668366b036#diff-359c7f7a6d32d9935951e1b0742eb116fb654f4a932c8d40328bb5dcab2fa111L162
[2] https://github.com/chillerlan/php-qrcode/issues/97