Werk #2824: juniper_alarm: fixed crash during service discovery

Component	Checks & agents
Title	juniper_alarm: fixed crash during service discovery
Date	Jan 8, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3p6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Some juniper devices did not provide the OID required by the check. The check will no longer crash when this happens.

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