[CAT-531] NullPointerException: LookFragment.onActivityCreated

added try/catch to location of possible exceptions

JIRA:
https://jira.catrob.at/browse/CAT-531

Jenkins:
https://jenkins.catrob.at/view/All-Categories/view/Catroid-multi-job/job/Catroid-Multi-Job-Custom-Branch/2306/