Deserialize empty plugin whitelist from settings.

src/library.cpp

@@ -267,7 +267,8 @@ void checkUpdates() {
 		std::map<std::string, std::set<std::string>> moduleWhitelist;
 		for (const auto& pluginPair : settings::moduleWhitelist) {
 			// Create an empty set
-			moduleWhitelist[pluginPair.first];
+			std::string pluginSlug = pluginPair.first;
+			moduleWhitelist[pluginSlug];
 		}
 
 		// Iterate plugins
@@ -281,7 +282,6 @@ void checkUpdates() {
 			json_array_foreach(modulesJ, moduleIndex, moduleSlugJ) {
 				std::string moduleSlug = json_string_value(moduleSlugJ);
 				// Insert module in whitelist
-				DEBUG("plugin %s module %s", pluginSlug, moduleSlug.c_str());
 				moduleWhitelist[pluginSlug].insert(moduleSlug);
 			}
 		}

src/settings.cpp

@@ -399,11 +399,15 @@ void fromJson(json_t* rootJ) {
 		const char* pluginSlug;
 		json_t* pluginJ;
 		json_object_foreach(moduleWhitelistJ, pluginSlug, pluginJ) {
+			// Create an empty modules set, even if there are no modules in the whitelist.
+			// An empty set means no modules will be displayed in the Browser.
+			auto& modules = moduleWhitelist[pluginSlug];
+
 			size_t moduleIndex;
 			json_t* moduleJ;
 			json_array_foreach(pluginJ, moduleIndex, moduleJ) {
 				std::string moduleSlug = json_string_value(moduleJ);
-				moduleWhitelist[pluginSlug].insert(moduleSlug);
+				modules.insert(moduleSlug);
 			}
 		}
 	}