QA filters break on internal error in pegelonline

[Maddoc42]

QA filter throws exception (1) when pegelonline source is experiencing an internal error (2)

(1)

java.lang.NullPointerException at org.jvalue.ods.qa.improvement.CombineSourceFilter.filter(CombineSourceFilter.java:74)
at org.jvalue.ods.qa.improvement.CombineSourceFilter.filter(CombineSourceFilter.java:48)
at org.jvalue.ods.filter.FilterChain.filter(FilterChain.java:49)
at org.jvalue.ods.filter.FilterChain.filter(FilterChain.java:50)
at org.jvalue.ods.filter.FilterChainManager.startFilterChains(FilterChainManager.java:63)
at org.jvalue.ods.grabber.DataGrabberMain.updateData(DataGrabberMain.java:64)
at org.jvalue.ods.server.ContainerRestletApp.run(ContainerRestletApp.java:118)
at java.lang.Thread.run(Thread.java:744)

(2)
http://pegelonline.wsv.de/webservices/rest-api/v2/stations.json

currently (18.07.14 12:52) returns

{
   status: 500,
   message: "Internal server error. Please retry."
}