csvsql: don't try to insert data if there are no data rows (fixes #299)
csvsql: don't try to insert data if there are no data rows (fixes #299)

onyxfish/csvkit,snuggles08/csvkit,dannguyen/csvkit,Tabea-K/csvkit,gepuro/csvkit,jpalvarezf/csvkit,elcritch/csvkit,wjr1985/csvkit,unpingco/csvkit,aequitas/csvkit,arowla/csvkit,haginara/csvkit,doganmeh/csvkit,Jobava/csvkit,tlevine/csvkit,kyeoh/csvkit,reubano/csvkit,themiurgo/csvkit,nriyer/csvkit,wireservice/csvkit,KarrieK/csvkit,bmispelon/csvkit,archaeogeek/csvkit,bradparks/csvkit__query_join_filter_CSV_cli,barentsen/csvkit,matterker/csvkit