Werk #1297: emcvnx_hba: Prevent old emc versions from inventory

Component	Checks & agents
Title	emcvnx_hba: Prevent old emc versions from inventory
Date	Oct 28, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Old Versions of EMC don't have any information about Read and Write blocks, so that check crashed.

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