Werk #6747: oracle_tablespaces: Check for empty filenames

Component	Checks & agents
Title	oracle_tablespaces: Check for empty filenames
Date	Oct 10, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0p6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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