Werk #4743: f5_bigip_conns: Fixed crash if empty values

Component	Checks & agents
Title	f5_bigip_conns: Fixed crash if empty values
Date	May 24, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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