Fixed bug w Zoom and Exclude with no brushed data
Fixed bug w Zoom and Exclude with no brushed data

See #35

serenayl/DesignExplorer,serenayl/DesignExplorer,MingboPeng/DesignExplorer,tt-acm/DesignExplorer,tt-acm/DesignExplorer,MingboPeng/DesignExplorer