Web throws NPE when filtering calls with RPC internal types

[Xylus]

When filtering RPC calls on Pinpoint web, NullPointerException is thrown.

This is due to a missing check inside the filtering logic. WAS -> WAS filtering checks each span event for its ServiceType and if it is in the RPC range (9000~9999), does an equals check with the span event's destinationId. Since RPC internal methods does not have a destinationId, while being within the RPC range, NPE is thrown.

Fix needs 2 checks - to check if the span event's ServiceType is set to record statistics, and to check for null destinationId.