Werk #12642: oracle_rman: fix crash "KeyError(ROSPROD.DB_INCR_0)"

Component	Checks & agents
Title	oracle_rman: fix crash "KeyError(ROSPROD.DB_INCR_0)"
Date	Mar 24, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The parsing of the oracle_rman section crashed if the section contained level 1 backup information but no level 0 backup information.

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