Werk #13648: Fix failed "Migrate LDAP connections" of connections without bind credentials

Component	User interface
Title	Fix failed "Migrate LDAP connections" of connections without bind credentials
Date	May 13, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0b9 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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