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ATS has several metircs of proxy.process.net.calls_to_.* and 2 of them are not working.

$ traffic_ctl metric match proxy.process.net.calls_to
proxy.process.net.calls_to_read 616958
proxy.process.net.calls_to_read_nodata 193461
proxy.process.net.calls_to_readfromnet 0            ///< !
proxy.process.net.calls_to_readfromnet_afterpoll 0  ///< !
proxy.process.net.calls_to_write 374065
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This Bug Report affects these Traffic Control components:

• Traffic Portal

Current behavior:

The ds charts view in TP has an error if the api returns no values. Example:

https://tp.domain.tld/#!/delivery-services/42/charts?type=HTTP <-- this view calls GET /api/4.0/deliveryservice_stats

If the api endpoint returns no values (series.values = null), it will throw this error: