do not try to reload deleted image

deleted image is replaced by the next one from the list, keep
the old image displayed until the new one is set

src/image.c

@@ -1442,6 +1442,8 @@ static void image_notify_cb(FileData *fd, NotifyType type, gpointer data)
 
 	if ((type & (NOTIFY_REREAD | NOTIFY_CHANGE)) && fd == imd->image_fd)
 		{
+		if ((type & NOTIFY_CHANGE) && fd->change && fd->change->type == FILEDATA_CHANGE_DELETE)
+			return; /* keep the image displayed, it will be replaced by the next image from the list soon */
 		DEBUG_1("Notify image: %s %04x", fd->path, type);
 		image_reload(imd);
 		}

src/layout_image.c

@@ -1879,9 +1879,11 @@ static void layout_image_maint_removed(LayoutWindow *lw, FileData *fd)
 				layout_image_set_collection(lw, cd, new);
 				return;
 				}
+			layout_image_set_fd(lw, NULL);
 			}
-
-		layout_image_set_fd(lw, NULL);
+
+		/* the image will be set to the next image from the list soon,  
+		   setting it to NULL here is not necessary*/
 		}
 }