fix course mode

stepmania/src/ScreenGameplay.cpp

@@ -528,9 +528,6 @@ ScreenGameplay::ScreenGameplay( CString sName, bool bDemonstration ) : Screen("S
 
 		m_textStepsDescription[p].LoadFromFont( THEME->GetPathToF("ScreenGameplay StepsDescription") );
 		m_textStepsDescription[p].SetName( ssprintf("StepsDescriptionP%i",p+1) );
-		Steps* pSteps = GAMESTATE->m_pCurNotes[p];
-		ASSERT( pSteps );
-		m_textStepsDescription[p].SetText( pSteps->GetDescription() );
 		SET_XY( m_textStepsDescription[p] );
 		this->AddChild( &m_textStepsDescription[p] );
 	}
@@ -863,6 +860,9 @@ void ScreenGameplay::LoadNextSong()
 
 		SetupSong( p, iPlaySongIndex );
 
+		ASSERT( GAMESTATE->m_pCurNotes[p] );
+		m_textStepsDescription[p].SetText( GAMESTATE->m_pCurNotes[p]->GetDescription() );
+
 		/* Increment the play count even if the player fails.  (It's still popular,
 		 * even if the people playing it aren't good at it.) */
 		if( !m_bDemonstration )

stepmania/src/SongCreditDisplay.cpp

@@ -21,6 +21,9 @@ SongCreditDisplay::SongCreditDisplay()
 	this->LoadFromFont( THEME->GetPathToF("SongCreditDisplay",(CString)"text") );
 	
 	Song* pSong = GAMESTATE->m_pCurSong;
+	if( pSong == NULL ) /* probably course mode */
+		return;
+
 	CString s;
 	s += pSong->GetFullDisplayTitle() + "\n";
 	s += pSong->GetDisplayArtist() + "\n";