Fix out-of-bound array access (IMAP) #229
Merged
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Fixes #169
The IMAP method allows user names with or without a domain part. For user names without a domain part, it still tries to access the (then non-existing) domain, resulting in "Error: Undefined array key 1 at .../nextcloud/apps/user_external/lib/IMAP.php#85" log messages.