Added note about checking dwi chart length of at least 2 characters

src/NotesLoaderDWI.cpp

@@ -437,10 +437,12 @@ static bool LoadFromDWITokens(
 {
 	CHECKPOINT_M( "DWILoader::LoadFromDWITokens()" );
 	
+	// If there's no step data to load for this chart, bail out here, instead of letting
+	// SetNoteData() throw an assertion.
+	// If the step data isn't at least 2 characters long, ParseNoteData() runs the risk
+	// of trying to read past the end of the string.
 	if (sStepData1.size() < 2 && sStepData2.size() < 2)
 	{
-		// If there's no step data to load for this chart, bail out here, instead of letting
-		// SetNoteData() throw an assertion.
 		LOG->Warn("Song file \"%s\" has malformed chart data for chart %s:%s:%s. Skipping chart.", sPath.c_str(), sMode.c_str(), sDescription.c_str(), sNumFeet.c_str());
 		return false;
 	}