dataset: error with space in rule language
Needs backport to 5.0, Needs backport to 6.0
If there is a space following a keyword that does not expect a value,
the rule fails to load due to improper value evaluation.
e.g. Space after set command
alert http any any -> any any (http.user_agent; dataset:set ,ua-seen,type string,save datasets.csv; sid:1;)
[ERRCODE: SC_ERR_UNKNOWN_VALUE(129)] - dataset action "" is not supported.