Werk #4375: check_sql: Fixed reporting configuration issues to monitoring core

Component Checks & agents
Title check_sql: Fixed reporting configuration issues to monitoring core
Date Feb 17, 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)
1.4.0b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)
1.2.8p18 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The plugin was writing it's textual output to stderr in case of errors or configuration problems which is not processed by the core. So the plugin output could be empty.

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