* Added new Playlist notification ImportFailed().

The PlaylistListView will trigger it when the import command
   failed (happens for example when none of the files are
   media files).
 * Moved displaying the according alert from the import fommand
   into the MainWindow. Show the window if necessary. This fixes
   MediaPlayer just idling in the Deskbar without any window
   in this case, since the MainWindow is shown after the first
   call to _SetupWindow() since some time. But _SetupWindow() is
   not invoked when no file could be opened.
 * Removed some meanwhile useless debug output. 


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38757 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/mediaplayer/MainWin.cpp

@@ -533,11 +533,9 @@ MainWin::MessageReceived(BMessage* msg)
 		}
 
 		case B_REFS_RECEIVED:
-			printf("MainWin::MessageReceived: B_REFS_RECEIVED\n");
 			_RefsReceived(msg);
 			break;
 		case B_SIMPLE_DATA:
-			printf("MainWin::MessageReceived: B_SIMPLE_DATA\n");
 			if (msg->HasRef("refs"))
 				_RefsReceived(msg);
 			break;
@@ -604,6 +602,15 @@ MainWin::MessageReceived(BMessage* msg)
 			}
 			break;
 		}
+		case MSG_PLAYLIST_IMPORT_FAILED:
+		{
+			BAlert* alert = new BAlert("Nothing to Play", "None of the files "
+				"you wanted to play appear to be media files.", "OK");
+			alert->Go();
+
+			_ShowIfNeeded();
+			break;
+		}
 
 		// ControllerObserver messages
 		case MSG_CONTROLLER_FILE_FINISHED: