[BUGFIX] Exception in list module for CEs with language -1

[kitzberger]

InvalidArgumentException: Language -1 does not exist on site xyz

[coveralls]

Pull Request Test Coverage Report for Build 10384949753

Details

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.04%) to 67.833%

---

Totals
Change from base Build 10320966645:	0.04%
Covered Lines:	1105
Relevant Lines:	1629

---

💛 - Coveralls

[twoldanski]

@kitzberger Looks good. Thx. Can you amend commit message to stick with convention (BUGFIX instead of FIX)