Usin global var stationList. Working now

dataacquisition/DwdAcquisition.py

@@ -33,7 +33,8 @@ def loadDWDGauges():
     
     return stationList
 
-def filterDWDGauges(stationList):
+def filterDWDGauges():
+    global stationList
     stationList = stationList.loc[stationList['country'] == "Germany"]
     
     stationList['lat'] = pd.to_numeric(stationList['lat'], errors='coerce', downcast='float')