changed pcIsColoredBy to the first of PC dim, instead of inputParam when no "in:" data available
changed pcIsColoredBy to the first of PC dim, instead of inputParam when no "in:" data available

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