#80: Add a simple progress indication for report creation - fixed NPE…

… in case TaskManager.startProgress() was not called

src/main/java/com/xceptance/xlt/report/util/TaskManager.java

@@ -51,12 +51,13 @@ private static class SingletonHolder
     private static final long INTERVAL = 500;
 
     /**
-     * The current progress bar
+     * The current progress bar. Never <code>null</code>. Note that the initial progress bar is inactive. To get active
+     * visual progress, call {@link #startProgress(String)}.
      */
-    private volatile ProgressBar progressBar;
+    private volatile ProgressBar progressBar = new ProgressBarBuilder().setStyle(ProgressBarStyle.ASCII).build().pause();
 
     /**
-     * Total task for that progress
+     * Total tasks for the progress bar.
      */
     private final AtomicInteger totalTasks = new AtomicInteger(0);
 
@@ -125,12 +126,15 @@ public void run()
                 try
                 {
                     task.run();
-                    progressBar.step();
                 }
                 catch (Exception e)
                 {
                     log.error("Failed to execute task", e);
                 }
+                finally
+                {
+                    progressBar.step();
+                }
             }
         });
     }