[Tasks] Crash fix with data input sanitization (#2629)

common/strings.cpp

@@ -192,7 +192,7 @@ std::string Strings::Escape(const std::string &s)
 bool Strings::IsNumber(const std::string &s)
 {
 	try {
-		auto r = stod(s);
+		auto r = stoi(s);
 		return true;
 	}
 	catch (std::exception &) {

zone/task_manager.cpp

@@ -232,7 +232,9 @@ bool TaskManager::LoadTasks(int single_task)
 		);
 
 		for (auto &&e : zones) {
-			ad->zone_ids.push_back(std::stoi(e));
+			if (Strings::IsNumber(e)) {
+				ad->zone_ids.push_back(std::stoi(e));
+			}
 		}
 
 		ad->optional = a.optional;