Throw sensible error for wrong mission choice

Create Mission XML aboarded abnormally (e.g. when wrong mission was chosen). Fixed this

create_mission_xml/src/create_mission_xml.cpp

@@ -27,10 +27,14 @@
  */
 create_mission_xml::create_mission_xml(const int argc, char *argv[], const std::string &toolName,
                                  const std::string &toolVersion)
-  : Module(argc, argv, toolName, toolVersion) {
-  std::string mission_choice = EndnodeReadOnly<std::string>("program_settings/mission_selector").read(rtIO_->moduleConfig).value();
-  route_ = {mission_choice}; // By now, only one level depth vector
-  missionStrategy_.setStrategy(missionSelection_(route_)(rtIO_));
+    : Module(argc, argv, toolName, toolVersion) {
+    std::string mission_type = EndnodeReadOnly<std::string>("program_settings/mission_selector").read(rtIO_->moduleConfig).value();
+    if (mission_type != "design_mission" && mission_type != "study_mission" && mission_type != "requirements_mission") {
+        throwError(__FILE__, __func__, __LINE__, "Specified mission '" + mission_type +
+                "' is unkown! Only use 'design_mission', 'study_mission' or 'requirements_mission'. Abort program!");
+    }
+    route_ = {mission_type}; // By now, only one level depth vector
+    missionStrategy_.setStrategy(missionSelection_(route_)(rtIO_));
 }
 
 strategyaccess create_mission_xml::missionSelection_(const std::vector<std::string> &route) {
@@ -39,6 +43,6 @@ strategyaccess create_mission_xml::missionSelection_(const std::vector<std::stri
         {"design_mission",       [](const std::shared_ptr<RuntimeIO>& arg) { return std::make_unique<design_mission::standard_mission>(arg); }},
         {"study_mission",        [](const std::shared_ptr<RuntimeIO>& arg) { return std::make_unique<study_mission::standard_mission>(arg); }},
         {"requirements_mission", [](const std::shared_ptr<RuntimeIO>& arg) { return std::make_unique<requirements_mission::standard_mission>(arg); }}
-  };
-  return table[route.at(0)];
+    };
+    return table[route.at(0)];
 }