Werk #7900: BI: Fix "Request-URI Too Long" after creating BI rule

Component	Setup
Title	BI: Fix "Request-URI Too Long" after creating BI rule
Date	Jun 27, 2019
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) 1.6.0b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0p20 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When creating a BI rule in WATO and clicking on the icon button to show the rule tree, this could lead to an HTTP Request-URI too long error.

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