More validation fixes

Exploration Queries/InputEntity_Host/MostPrevIn_ByHost.yaml

@@ -19,6 +19,7 @@ query: |
   _Im_NetworkSession(hostname_has_any=v_Host_HostName)
   | where EventResult =~ "success"
   | where NetworkDirection =~ "Inbound"
+  | extend LocalAppName = column_ifexists("LocalAppName", "")
   | extend info = pack('Computer', DvcHostname, 'LocalPortNumber', DstPortNumber, 'DstIpAddr', Dst, 'SrcIpAddr', Src,'Direction', NetworkDirection, 'NetworkProtocol', NetworkProtocol, "LocalAppName", LocalAppName)
   | summarize Process_Aux_Min_SessionStartTime=min(TimeGenerated), Process_Aux_Max_SessionStartTime=max(TimeGenerated), count(), IP_Aux_info = make_set(info, maxSize=1000) by Src, Dvc
   | top 10 by count_ desc