Added the usage report to the examples for when no arguments are passed

to the examples.

examples/osganimate/osganimate.cpp

@@ -193,7 +193,7 @@ int main( int argc, char **argv )
     osg::ArgumentParser arguments(&argc,argv);
 
     // set up the usage document, in case we need to print out how to use this program.
-    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getProgramName()+" [options] filename ...");
+    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
     arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");
 
     // initialize the viewer.
@@ -221,7 +221,7 @@ int main( int argc, char **argv )
         arguments.writeErrorMessages(std::cout);
         return 1;
     }
-
+    
     // load the nodes from the commandline arguments.
     osg::Node* model = createModel();
     if (!model)