Fix comments and style in BrowserWidget._validate
Fix comments and style in BrowserWidget._validate

manthey/girder,jbeezley/girder,RafaelPalomar/girder,girder/girder,data-exp-lab/girder,data-exp-lab/girder,adsorensen/girder,Xarthisius/girder,Kitware/girder,RafaelPalomar/girder,girder/girder,Xarthisius/girder,RafaelPalomar/girder,Xarthisius/girder,jbeezley/girder,kotfic/girder,adsorensen/girder,Xarthisius/girder,Kitware/girder,jbeezley/girder,girder/girder,data-exp-lab/girder,data-exp-lab/girder,jbeezley/girder,manthey/girder,RafaelPalomar/girder,RafaelPalomar/girder,manthey/girder,adsorensen/girder,Xarthisius/girder,girder/girder,adsorensen/girder,adsorensen/girder,kotfic/girder,kotfic/girder,kotfic/girder,Kitware/girder,Kitware/girder,kotfic/girder,data-exp-lab/girder,manthey/girder