added Error-Stream of the training

src/main/java/de/monticore/lang/monticar/emadl/generator/EMADLGenerator.java

@@ -186,15 +186,22 @@ public class EMADLGenerator {
                     ProcessBuilder pb = new ProcessBuilder(Arrays.asList(pythonExe, trainingPath));
                     Process p = pb.start();
 
-                    BufferedReader bfr = new BufferedReader(new InputStreamReader(p.getInputStream()));
+                    BufferedReader bfr1 = new BufferedReader(new InputStreamReader(p.getInputStream()));
+                    BufferedReader bfr2 = new BufferedReader(new InputStreamReader(p.getErrorStream()));
                     String line = "";
                     System.out.println("Starting training of " + trainConfigFilename);
                     int exitCode = p.waitFor();
                     System.out.println("Exit Code : " + exitCode);
-                    line = bfr.readLine();
+                    line = bfr1.readLine();
                     System.out.println("First Line: " + line);
-                    while ((line = bfr.readLine()) != null){
-                        System.out.println("python output:" + line);
+                    while (line != null){
+                        System.out.println(line);
+                        line = bfr1.readLine();
+                    }
+                    line = bfr2.readLine();
+                    while(line != null){
+                        System.out.println(line);
+                        line = bfr2.readLine();
                     }
                     }catch(Exception e){System.out.println(e);}
                 }else{System.out.println("Trainingfile not found.");}