neutrinoyparser.cpp, tuxboxapi: avoid possible crashes without g_bouquetManager instance

This was observed without physical frontends and in certain
circumstances while using the web interface, e.g. if users are
using bouquet functionalities.


Origin commit data
------------------
Commit: fbc873caf6
Author: Thilo Graf <dbt@novatux.de>
Date: 2022-11-15 (Tue, 15 Nov 2022)

src/nhttpd/tuxboxapi/controlapi.cpp

@@ -1424,6 +1424,9 @@ std::string CControlAPI::_GetBouquetWriteItem(CyhookHandler *hh, CZapitChannel *
 //-------------------------------------------------------------------------
 void CControlAPI::GetBouquetCGI(CyhookHandler *hh)
 {
+	if (g_bouquetManager ==  NULL)
+		return;
+
 	TOutType outType = hh->outStart(true /*old mode*/);
 
 	std::string result = "";
@@ -2165,6 +2168,9 @@ void CControlAPI::ReloadNeutrinoSetupCGI(CyhookHandler *hh)
 
 void CControlAPI::ReloadPluginsCGI(CyhookHandler *hh)
 {
+	if (g_Plugins ==  NULL)
+		return;
+
 	g_Plugins->loadPlugins();
 	hh->SendOk();
 }

src/nhttpd/tuxboxapi/neutrinoyparser.cpp

@@ -228,6 +228,9 @@ std::string  CNeutrinoYParser::func_get_bouquets_as_dropdown(CyhookHandler *, st
 	std::string yresult, sel, nr_str, do_show_hidden;
 	int nr=1;
 
+	if (g_bouquetManager == NULL)
+		return "0";
+
 	ySplitString(para," ",nr_str, do_show_hidden);
 	if(!nr_str.empty())
 		nr = atoi(nr_str.c_str());
@@ -255,6 +258,9 @@ std::string  CNeutrinoYParser::func_get_bouquets_as_dropdown(CyhookHandler *, st
 //-------------------------------------------------------------------------
 std::string  CNeutrinoYParser::func_get_bouquets_as_templatelist(CyhookHandler *, std::string para)
 {
+	if (g_bouquetManager == NULL)
+		return "";
+
 	std::string yresult, ytemplate, do_show_hidden;
 
 	ySplitString(para,"~",ytemplate, do_show_hidden);
@@ -279,6 +285,9 @@ std::string  CNeutrinoYParser::func_get_bouquets_as_templatelist(CyhookHandler *
 //-------------------------------------------------------------------------
 std::string  CNeutrinoYParser::func_get_actual_bouquet_number(CyhookHandler *, std::string)
 {
+	if (g_bouquetManager == NULL)
+		return "0";
+
 	int actual=0;
 	for (int i = 0; i < (int) g_bouquetManager->Bouquets.size(); i++) {
 		if(g_bouquetManager->existsChannelInBouquet(i, CZapit::getInstance()->GetCurrentChannelID())) {
@@ -331,6 +340,10 @@ std::string  CNeutrinoYParser::func_get_channels_as_dropdown(CyhookHandler *, st
 std::string CNeutrinoYParser::func_get_bouquets_with_epg(CyhookHandler *hh, std::string para)
 {
 	int BouquetNr = 0;
+
+	if (g_bouquetManager == NULL)
+		return "0";
+
 	std::string abnumber, tmp,yresult;
 	ZapitChannelList channels;
 	//int num;
@@ -1135,6 +1148,9 @@ std::string  CNeutrinoYParser::func_set_timer_form(CyhookHandler *hh, std::strin
 	hh->ParamList["timer_repeatCount"]  = itoa(timer.repeatCount);
 
 	// program row
+	if (g_bouquetManager == NULL)
+		return "";
+
 	t_channel_id current_channel = (cmd == "new") ? CZapit::getInstance()->GetCurrentChannelID() : timer.channel_id;
 	CBouquetManager::ChannelIterator cit = g_bouquetManager->tvChannelsBegin();
 	for (; !(cit.EndOfChannels()); cit++) {
@@ -1184,6 +1200,9 @@ std::string  CNeutrinoYParser::func_set_timer_form(CyhookHandler *hh, std::strin
 //-------------------------------------------------------------------------
 std::string  CNeutrinoYParser::func_bouquet_editor_main(CyhookHandler *hh, std::string para)
 {
+	if (g_bouquetManager == NULL)
+		return "0";
+
 	std::string yresult;
 	int selected = -1;
 	if (hh->ParamList["saved"] == "1")