Data incorrectly pushed to series-connector

[janezhang10]

Describe the bug
Data is being pushed upon every Live tick to iot-time-series-connector when in Live mode. The prevDataCache for hasRequestedInformationChanged() is sometimes undefined, which causes hasRequestedInformationChanged to always return true.

To Reproduce
Steps to reproduce the behavior:

1. Have a working testing-ground with working assetIds
2. Produce a time series chart with duration '1m' (preferably line chart so that the data is aggregated compared to scatter)
3. Have some console logs in hasRequestedInformationChanged that details prevDataStreamStore
4. Run the App Kit locally and inspect the page
5. See that prevDataStreamStore is occasionally undefined in console

Expected behavior
Only new incoming data should be pushed to iot-time-series-connector in Live mode. hasRequestedInformationChanged should only return true if there's new incoming data that needs to be rendered, and prevDataCache should only be undefined upon initialization of DataCache.

Screenshots
example of prevDataStreamStore being undefined while currDataStreamStore is defined after letting App Kit run locally for a while.

Desktop (please complete the following information):

• OS: macOS Monterey
• Browser Firefox
• Version 91.10.0esr

Additional context
The frequency of prevDataCache being undefined depends on the duration of the viewport. The smaller the duration (e.g. 1 minute), the more often prevDataCache is undefined (about every other tick).

[NorbertNader]

This issue no longer exists in latest version.