Thold doesnt run in undefined value

[nicolapiazzi]

If you see this graph it read a value from snmp about process memory
I killed the process so doing snmp it return an undefined value
if you see graph it still write the last value that have at 14:30 wioth an hole in draw

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Doing a debug i see no value for it (U)
2018/05/31 14:47:11 - SPINE: Poller[Main Poller] Device[38] Device[M.ADSYNC] TH[1] Graphs[M.ADSYNC - Process - nxlog.exe, M.ADSYNC - Process - nxlog.exe] DS[M.ADSYNC - Process - |query_hrSWRunName|] SNMP: v2: ADSYNC, dsname: proc_mem, oid: .1.3.6.1.2.1.25.5.1.1.2.1296, value: U
2018/05/31 14:47:11 - SPINE: Poller[Main Poller] Device[38] Device[M.ADSYNC] TH[1] Graphs[M.ADSYNC - Process - nxlog.exe, M.ADSYNC - Process - nxlog.exe] DS[M.ADSYNC - Process - |query_hrSWRunName|] SNMP: v2: ADSYNC, dsname: proc_cpu, oid: .1.3.6.1.2.1.25.5.1.1.1.1296, value: U

But thold consider - value and doesnt trigger it

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