Werk #11418: WATO: do not create empty rules.mk files when saving rulesets

Component	Setup
Title	WATO: do not create empty rules.mk files when saving rulesets
Date	Oct 21, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0p19 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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