Solved the issue where a song located directly in the Songs folder wo…

…uld crash the game instantly, it now loads into a group called "Songs"

fixes maybe

set group for stray songs in the song folders as "Ungrouped Songs"

also efficiency changes

src/Player.cpp

@@ -3523,7 +3523,7 @@ Player::RenderAllNotesIgnoreScores()
 			// Find the tapnote we are on
 			TapNote* pTN = NULL;
 			NoteData::iterator iter = m_NoteData.FindTapNote(track, row);
-			DEBUG_ASSERT(iter != m_NoteData.end(col));
+			DEBUG_ASSERT(iter != m_NoteData.end(track));
 			pTN = &iter->second;
 
 			// Reset the score so it can be visible

src/Song.cpp

@@ -379,7 +379,7 @@ Song::FinalizeLoading()
 	// save group name
 	vector<RString> sDirectoryParts;
 	split(m_sSongDir, "/", sDirectoryParts, false);
-	ASSERT(sDirectoryParts.size() >= 4); /* e.g. "/Songs/Slow/Taps/" */
+	// ASSERT(sDirectoryParts.size() >= 4); /* e.g. "/Songs/Slow/Taps/" */
 	m_sGroupName =
 	  sDirectoryParts[sDirectoryParts.size() - 3]; // second from last item
 	ASSERT(m_sGroupName != "");