set up new internal error reporter mock

unittests/tmtcservices/testSendHelper.cpp

@@ -1,5 +1,7 @@
 #include <catch2/catch_test_macros.hpp>
 
-TEST_CASE("TM Send Helper", "[tm-send-helper]") {
+#include "fsfw/tmtcservices/TmSendHelper.h"
 
+TEST_CASE("TM Send Helper", "[tm-send-helper]") {
+  TmSendHelper sendHelper(nullptr);
 }