Fix issue with empty evbuilder monitor data

When using a trigger other than the digi multiplicity trigger is used, some eventbuilder monitor data returned nan values, resulting in data being rejected by InfluxDB and consequently not being displayed in the Grafana monitor. Catching of the nans was done in !1806 (merged); this MR assured that the number of triggers and events are properly communicated to the monitor.

requested review from @p.-a.loizeau

assigned to @fweig

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Dear @d.smith, @fweig,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

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