Send fake data if there is no battey consumption entry list

Sends fake data into SettingsIntelligence if there is no data in the
battery consumption list, otherwise we don't have battery level data to
draw into the chart graph. We should draw the battery levels if it is
full-charged without any BatteryEntry data.

Bug: 184807417
Test: make SettingsRoboTests
Test: make SettingsGoogleRoboTests
Change-Id: I759e769256f4aa0ec152afff5c265ee3d04c03da