Fix NPE in EmailAlertingReporterService

Author: vjuranek

web/src/main/java/org/perfrepo/web/service/EmailAlertingReporterService.java

@@ -110,6 +110,10 @@ private String composeMessage(List<Alert> alerts, TestExecution testExecution) {
     * @return evaluated description
     */
    private String getEvaluatedDescription(Alert alert) {
+      if (alert.getDescription() == null || alert.getDescription().isEmpty()) {
+         return "";
+      }
+      
       ScriptEngine engine = new ScriptEngineManager().getEngineByName("JavaScript");
 
       //regex pattern for ${expression}