#87 Edit attribute window does not open

[Dado]

Can't open "edit attributre" window on some attributes.
See video in attachments ;)

Tested on Linux - versions 1.3.1 and 1.3.2-SNAPSHOT

$ java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)

[Dado]

The same items can't be deleted.