added exception handling

src/main/java/ninja/javafx/smartcsv/fx/table/model/CSVModel.java

@@ -158,7 +158,7 @@ public class CSVModel {
                 @Override
                 protected List<ValidationError> call() throws Exception {
                     List<ValidationError> errors = new ArrayList<>();
-
+                    try {
                         if (header != null) {
                             ValidationError headerError = validator.isHeaderValid(header);
                             if (headerError != null) {
@@ -187,6 +187,9 @@ public class CSVModel {
                                 }
                             }
                         }
+                    } catch (Throwable t) {
+                        logger.error("validation error", t);
+                    }
                     return errors;
                 }
             };