Explicitly require and use capital NULL and ITG everywhere for sync bias, comment fix, nullptr check for group

src/Group.cpp

@@ -36,8 +36,9 @@ Group::Group() {
     m_sBannerPath = "";
 }
 
-Group::~Group() {
-    SONGMAN->GetGroupGroupMap().erase(m_sGroupName);
+Group::~Group() 
+{
+
 }
 
 Group::Group(const RString& sDir, const RString& sGroupDirName) {
@@ -63,7 +64,7 @@ Group::Group(const RString& sDir, const RString& sGroupDirName) {
         Trim(sVersion);
 
         // Only read the Pack.ini if the version is set
-        // Otherwise log a warning and skip reading the 
+        // Otherwise log a warning and use default Pack.ini values
         if (!sVersion.empty()) {
             m_bHasPackIni = true;
             m_iVersion = StringToInt(sVersion);
@@ -94,9 +95,9 @@ Group::Group(const RString& sDir, const RString& sGroupDirName) {
             ini.GetValue("Group", "SyncOffset", sValue);
             Trim(sValue);
             if (!sValue.empty()) {
-                if (sValue.CompareNoCase("null") == 0) {
+                if (sValue == "NULL") {
                     m_fSyncOffset = 0.0f;
-                } else if (sValue.CompareNoCase("itg") == 0) {
+                } else if (sValue == "ITG") {
                     m_fSyncOffset = -0.009f;
                 } else {
                     LOG->Warn("Group::Group: Invalid SyncOffset value: %s in Pack.ini. Valid values are NULL and ITG. Defaulting to NULL.", sValue.c_str());

src/ScreenOptionsMasterPrefs.cpp

@@ -947,7 +947,7 @@ static void InitializeConfOptions()
 			c.AddOption( ssprintf("%+i ms", i) );
 		ADD( c );
 	}
-	ADD( ConfOption( "MachineSyncBias",			MachineSyncBias,		"Null","|ITG" ) );
+	ADD( ConfOption( "MachineSyncBias",			MachineSyncBias,		"NULL","|ITG" ) );
 	ADD( ConfOption( "EnableAttackSounds",		MovePref<bool>,		"No","Yes" ) );
 	ADD( ConfOption( "EnableMineHitSound",		MovePref<bool>,		"No","Yes" ) );
 	ADD( ConfOption( "RateModPreservesPitch",		MovePref<bool>,		"No","Yes") );

src/SongManager.cpp

@@ -279,6 +279,12 @@ void SongManager::AddGroup( RString sDir, RString sGroupDirName, Group* group )
 	if( j != m_sSongGroupNames.size() )
 		return; // the group is already added
 
+	if ( group == nullptr ) {
+		// Could not AddGroup 'sGroupDirName'. Group object is null.
+		LuaHelpers::ReportScriptErrorFmt("Could not AddGroup '%s'. Group object is null.", sGroupDirName.c_str() );
+		return;
+	}
+
 	RString sBannerPath;
 
 	// Look for a group banner in this group folder