use deepGet to prevent errors fetching filter meta state
save app state when removing disabled filters
add test for handling filters that are just null
simulate clearing all filters in test
Merge pull request #2449 from w33ble/fix/disabled-filters

Fix - Removing disabled filters
Merge pull request #2196 from grouma/TimefilterAutoRefresh

Timefilter Auto Refresh - Closes "Support for auto-refresh #1845"