Werk #5002: Fixed possible exception related to multisite_user_connectors on login failures

Component	User interface
Title	Fixed possible exception related to multisite_user_connectors on login failures
Date	Jul 20, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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