Prevent crash of background service in case of problems
requested to merge 371-background-service-crashes-on-android-when-trying-to-add-a-problem-report into master
There was a bug which potentially caused the app to crash: When the app was not able to load the credentials for an account, it tried to create a problem report. However, there was no check if the problem manager was instantiated and hence this (potentially) triggered a crash due to invalid memory access.
Closes #371 (closed)