Werk #6850: Fixed broken ruleset search reset function

Component	Setup
Title	Fixed broken ruleset search reset function
Date	Nov 6, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The reset functionality of the ruleset search was not working at all. It always resulted in an exception like: "AttributeError: 'ModeRuleSearch' object has no attribute 'search_options'"

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