htp/htp_util.c: Do not invoke callbacks in htp_req_run_hook_body_data() when there is no tx running.
htp/htp_util.c: Do not invoke callbacks in htp_req_run_hook_body_data() when there is no tx running.

This situation was encountered when load testing an Apache Traffic Server
plugin that produced responses, not from the Origin Server but, directly from the
plugin.

glongo/libhtp,montekki/libhtp,glongo/libhtp,OISF/libhtp,wxsBSD/libhtp,glongo/libhtp,wxsBSD/libhtp,OISF/libhtp,glongo/libhtp,wxsBSD/libhtp,wxsBSD/libhtp,glongo/libhtp,montekki/libhtp,OISF/libhtp,montekki/libhtp,montekki/libhtp,OISF/libhtp,wxsBSD/libhtp,wxsBSD/libhtp,OISF/libhtp,glongo/libhtp,wxsBSD/libhtp,OISF/libhtp,montekki/libhtp,OISF/libhtp,glongo/libhtp,montekki/libhtp,montekki/libhtp