This is because url is build from 4 parts (cs_uri_scheme + "://" + cs_host + cs_uri_path + "?" + cs_uri_query) and when cs_uri_query is empty url will be empty.
Please adjust the TA and in props.conf instead of:
EVAL-url = cs_uri_scheme + "://" + cs_host + cs_uri_path + "?" + cs_uri_query
use:
EVAL-url = case(len(cs_uri_query)>0 AND len(cs_uri_path)>0,cs_uri_scheme + "://" + cs_host + cs_uri_path + "?" + cs_uri_query,
len(cs_uri_path)>0,cs_uri_scheme + "://" + cs_host + cs_uri_path,
1==1,cs_uri_scheme + "://" + cs_host)
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