Werk #7789: rds_licenses: Skip check plugin if no data available

Component	Checks & agents
Title	rds_licenses: Skip check plugin if no data available
Date	Jun 12, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p18 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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