Fixes #3179 : correct the Rule Grid to display error when Rules have invalid targets
Fixes #3189 : Fix directive saving process
Merge pull request #85 from ncharles/bug_3179/dev/add_check_to_group_existance

Fixes #3179 : correct the Rule Grid to display error when Rules have invalid targets
Merge pull request #88 from VinceMacBuche/bug_3189/Fix_new_directive_process

Fixes #3189 : Fix directive saving process