Merge pull request #196 from lofar-astron/improve-model-parse-error2

Fix confusing error when something is wrong with the model

DPPP/Predict.cc

@@ -110,8 +110,15 @@ namespace DP3 {
       ss << sourcePatterns;
       itsDirectionsStr = ss.str();
 
-      vector<string> patchNames=makePatchList(sourceDB, sourcePatterns);
+      vector<string> patchNames;
+      try {
+        patchNames = makePatchList(sourceDB, sourcePatterns);
         itsPatchList = makePatches (sourceDB, patchNames, patchNames.size());
+      }
+      catch(std::exception& exception)
+      {
+        throw std::runtime_error(std::string("Something went wrong while reading the source model. The error was: ") + exception.what());
+      }
       
 #ifdef HAVE_LOFAR_BEAM
       if (itsApplyBeam) {