[Dropdown] Cannot read property 'observe' of undefined

[GammaGames]

Bug Report

Steps to reproduce

1. Create search dropdown
2. Call dropdown on element with values and allowAdditions: true
3. Be sad when it doesn't work

Expected result

Should work all happy

Actual result

Throws error and dropdown is broken

Testcase

https://jsfiddle.net/6t70ce54/

Screenshot (when possible)

Version

2.7.5

Notes

Was initially reported at Semantic-Org/Semantic-UI/issues/5018, but the stale bot closed it. @nosheenzazafd had a solution as well:

Looking at the source code, I noticed that every time selectObserver is dereferenced, it is guarded with if(selectObserver), except for the statement at line 165. I believe this statement also needs to be guarded with the same check. I did this and it fixed my problem. If needed I can provide more details to reproduce this error, however it seems to be a logic bug in the code.

[lubber-de]

Fixed by #785 accordingly
See your adjusted jsfiddle here https://jsfiddle.net/7rsge546/