Invalid route makes DelHel crash

**Describe the bug**
A route like 
EDDP TO LEBB
FROM EDDP VIA EDDN TO LSZH
as filed made Del/Euroscope crash clicking on the cfl mark of that Pilot 
No sid or rwy was listed in the departure menu

**To Reproduce**
Probably file a route like this by vatsim fp, and click on cfl in dep list

**Expected behavior**
do not crash ES

**EuroScope plugins:**
 0.3.0
