feature: improved handling exception NoSuchElementException

app/src/main/java/ru/project/datasource/FileDataSource.java

@@ -34,7 +34,7 @@ public class FileDataSource implements DataSource{
             return null;
         }
         catch (NoSuchElementException e){
-            System.out.println("No such element");
+            System.out.println(e.getMessage() + "No such element");
             return null;
         }
     }

app/src/main/java/ru/project/datasource/StudentCsvReader.java

@@ -56,7 +56,7 @@ public class StudentCsvReader implements Iterator<Student> {
     public Student next() {
         lineOfFile++;
         if (!records.hasNext()) {
-            throw new NoSuchElementException();
+            throw new NoSuchElementException("Problem at line " + lineOfFile + ".");
         }
 
         CSVRecord record = records.next();