Werk #4101: citrix_sessions: Output error message in case of missing session information.

Component	Checks & agents
Title	citrix_sessions: Output error message in case of missing session information.
Date	Dec 12, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p15 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Previously, this check would crash.

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