AP_HAL_Empty: add panic method to scheduler

libraries/AP_HAL_Empty/Scheduler.cpp

@@ -3,6 +3,8 @@
 
 using namespace Empty;
 
+extern const AP_HAL::HAL& hal;
+
 EmptyScheduler::EmptyScheduler()
 {}
 
@@ -51,6 +53,11 @@ void EmptyScheduler::begin_atomic()
 void EmptyScheduler::end_atomic()
 {}
 
+void EmptyScheduler::panic(const prog_char_t *errormsg) {
+    hal.console->println_P(errormsg);
+    for(;;);
+}
+
 void EmptyScheduler::reboot() {
     for(;;);
 }

libraries/AP_HAL_Empty/Scheduler.h

@@ -24,6 +24,7 @@ public:
     void     begin_atomic();
     void     end_atomic();
 
+    void     panic(const prog_char_t *errormsg);
     void     reboot();
 
 };