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 Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p20 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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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