Style fixes
Merge branch 'dev-yannick'
Fixed categories that were not showing
Merge pull request #422 from emorency/OPAL-2227-add-attribute

Fixed categories that were not showing
OPAL-2227: Reset selection when refreshing the table of variables
Merge pull request #423 from emorency/OPAL-2227-add-attribute

OPAL-2227: Reset selection when refreshing the table of variables