Handle the remaining "Blocker" issues reported by Sonar

http://localhost:9000/project/issues?id=fusetools&resolved=false&severities=BLOCKER

currently there are 7.

Some of them are False positive.
Some of them, we might just ignore them
Maybe they are some to fix.

To mark as False positive, some "admin" rights are needed on SonarCloud.io for the Fuse Tools project. i guess lheinema@redhat.com have them? or maybe we need to pay for it?