Werk #10884: check_http: Add better validation for empty service names when using "^" prefix

Component	Setup
Title	check_http: Add better validation for empty service names when using "^" prefix
Date	Apr 8, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p12 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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