Werk #7777: Fix problem in legacy WATO plugin conversion

Component Setup
Title Fix problem in legacy WATO plugin conversion
Date Jun 11, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0b2
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

When using 3rd party extensions that register WATO rulesets in the pre 1.6 logic (by using thre register_rule()) method, this may result in an error like this on the package management page TypeError: type() argument 1 must be string, not unicode.

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