Fix crash from MusicWheel when in BuildWheelItemData(), and under case SORT_ENDLESS_COURSES. Automatically generated courses will cause there to be no group name, and the default (preferred) sort. When this function does not return a value, and it gets assigned to c (In MusicWheel), in some cases we will get a crash.

By default, I use white in the metrics, this doesn't look "great," but it should be up to the themer.

stepmania/Themes/default/metrics.ini

@@ -4365,6 +4365,7 @@ WriteSimpleValues=1
 TapsAndHolds=1
 
 [Course]
+SortPreferredColor=1,1,1,1	//Preferred is both for when courses are in preferred sort, or are autogen
 SortLevel1Color=1,0,0,1
 SortLevel2Color=1,1,0,1
 SortLevel3Color=1,0.5,0,1

stepmania/src/Course.cpp

@@ -51,6 +51,7 @@ XToLocalizedString( SongSort );
 /* Maximum lower value of ranges when difficult: */
 const int MAX_BOTTOM_RANGE = 10;
 
+#define SORT_PREFERRED_COLOR	THEME->GetMetricC("Course","SortPreferredColor")
 #define SORT_LEVEL1_COLOR		THEME->GetMetricC("Course","SortLevel1Color")
 #define SORT_LEVEL2_COLOR		THEME->GetMetricC("Course","SortLevel2Color")
 #define SORT_LEVEL3_COLOR		THEME->GetMetricC("Course","SortLevel3Color")
@@ -729,7 +730,8 @@ RageColor Course::GetColor() const
 	switch( PREFSMAN->m_CourseSortOrder )
 	{
 	case PrefsManager::COURSE_SORT_PREFERRED:
-		break;
+		return SORT_PREFERRED_COLOR;		//This will also be used for autogen'd courses in some cases.	
+
 	case PrefsManager::COURSE_SORT_SONGS:	
 		if( m_vEntries.size() >= 7 )				return SORT_LEVEL2_COLOR;
 		else if( m_vEntries.size() >= 4 )		return SORT_LEVEL4_COLOR;