Werk #1613: Fixed invalid json format in Stats query with requested heaeders

Component	Livestatus
Title	Fixed invalid json format in Stats query with requested heaeders
Date	Dec 3, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The "," after header line was missing

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