extended try-catch to catch an Unexpected NullPointerException
Merge pull request #1034 from Catrobat/cat-931

[CAT-931] extended try-catch
load droneprojekt if drone is enabled
Iml Files deleted

This reverts commit 6b74eab0cccf895d7f938edc27dd447a73657cfe.
create dronestandardproject if drone is enabled in gradleconfig
added reset default config, drone stability improvment
drone activated
take off / land brick merge