Werk #3870: elphase.include: more robust against none type params

Component	Checks & agents
Title	elphase.include: more robust against none type params
Date	Sep 8, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p11 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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