Autoconfig internal server error

[vondrt4]

Expected behavior

A meaningful validation error

Actual behavior

Error while creating the account: Internal Server Error

Mail app

**Mail app version: 0.11

There is a problem with insufficient validation of inputs in the function detectImapAndSmtp. When a new user enters an "e-mail address" that doesn't contain the character '@' in the setup form, this happens:

TypeError: Argument 1 passed to OCA\Mail\Service\AutoConfig\IspDb::query() must be of the type string, null given, called in /usr/share/nextcloud/apps/mail/lib/Service/AutoConfig/IspDbConfigurationDetector.php on line 94

    /usr/share/nextcloud/apps/mail/lib/Service/AutoConfig/IspDbConfigurationDetector.php - line 94:

    OCA\Mail\Service\AutoConfig\IspDb->query(null)

    /usr/share/nextcloud/apps/mail/lib/Service/AutoConfig/AutoConfig.php - line 53:

    OCA\Mail\Service\AutoConfig\IspDbConfigurationDetector->detectImapAndSmtp("a.b.com", "password", "A B")
...

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[ChristophWurst]

This was reworked in #2259. Please test with a recent version.