Fill in Steps::m_sDescription automatically if missing.

stepmania/src/NotesLoaderKSF.cpp

@@ -208,6 +208,8 @@ bool KSFLoader::LoadFromKSFFile( const CString &sPath, Steps &out, const Song &s
 
 	out.SetNoteData(&notedata);
 
+	out.TidyUpData();
+
 	return true;
 }
 

stepmania/src/Song.cpp

@@ -778,7 +778,9 @@ void Song::TidyUpData()
 	}
 
 	for( i=0; i<m_apNotes.size(); i++ )
+	{
 		m_apNotes[i]->Compress();
+	}
 }
 
 void Song::TranslateTitles()

stepmania/src/Steps.cpp

@@ -145,6 +145,11 @@ void Steps::TidyUpData()
 		default:	ASSERT(0);
 		}
 	}
+
+	if( m_sDescription.empty() )
+	{
+		m_sDescription = Capitalize( DifficultyToString(m_Difficulty) );
+	}
 }
 
 void Steps::Decompress() const