Missing initialization for api_error in dispatch-handle-run and dispatch-handle-register

[bontric]

The bool isset in api_error has to be initialized before usage. This is missing in dispatch-handle-run and dispatch-handle-register

// dispatch-handle-register.c:59
struct api_error *err = MALLOC(struct api_error);

// dispatch-handle-register:72
info.api_error = *err;
assert_non_null(err);

// dispatch-handle-register:139
assert_false(info.api_error.isset); // might fail 

// dispatch-handle-run.c:228
struct api_error *err = MALLOC(struct api_error);

// dispatch-handle-run:236
info.api_error = *err;
assert_non_null(err);

// dispatch-handle-run:272
assert_false(info.api_error.isset); // might fail 

[stze]

fixed in 59bd266 in #22