[vislib/dispatch] check if vis really isBrushable
[filterBar] prevent fatal when an empty filter array is found
[vislib/columnChart] check each chart, not just the last
[vislib/columnChart] only expect brush elements if the data is ordered
[vislib] keep original datum around for events
[vislib/tooltip] hide the tooltip if the formatter returns nothing
[aggResponse/pointSeries] fix tooltip tests
[vislib/dispatch] only enable brushing if we are able to run the handler
[filterBar] if no times extracted, don't change the time filter
[vislib] remove empty tests/suites
[vislib/columnChart] update tests for new brushing conditions
Merge remote-tracking branch 'spencer/fix/2169' into feature/heatmap-vis
tooltip working now