Fix panic: runtime error: slice bounds out of range in tsdb.measurementFromSeriesKey
Fix panic: runtime error: slice bounds out of range in tsdb.measurementFromSeriesKey

Writing points without tags caused this since strings.Index(key, ",") returned
-1 if there were no tags.

josephcopenhaver/influxdb,cnelissen/influxdb,endophage/influxdb,roobert/influxdb,jipperinbham/influxdb,stvnwrgs/influxdb,influxdata/influxdb,arussellsaw/influxdb,influxdata/influxdb,nckturner/influxdb,bluebreezecf/influxdb,Sotfo/influxdb,nickrobinson/influxdb,GoIncremental/influxdb,mash0304/influxdb,nckturner/influxdb,lgpeterson/influxdb,slachiewicz/influxdb,bluebreezecf/influxdb,n1tr0g/influxdb,marcosnils/influxdb,arussellsaw/influxdb,influxdb/influxdb,daachi/influxdb,michaelsproul/influxdb,bluebreezecf/influxdb,jonseymour/influxdb,influxdb/influxdb,wxdublin/influxdb,jportoles/influxdb092,Venu4thFeb/influxdb,pkittenis/influxdb,jonseymour/influxdb,josephcopenhaver/influxdb,marcosnils/influxdb,tuxmonteiro/influxdb,alexiri/influxdb,mcanthony/influxdb,vladlopes/influxdb,ninjasphere/influxdb,Yong-Lee/influxdb,trigrass2/influxdb,m4ce/influxdb,GrimDerp/influxdb,GoIncremental/influxdb,tuxmonteiro/influxdb,archsaber/influxdb,apigee/influxdb,ASAPPinc/influxdb,roobert/influxdb,slavau/influxdb,mcanthony/influxdb,mnuessler/influxdb,Sotfo/influxdb,timraymond/influxdb,tommymei/influxdb,Ancillas/influxdb,tjyang/influxdb,evanphx/influxdb,rnubel/influxdb,apigee/influxdb,sudabon/influxdb,mnuessler/influxdb,eminden/influxdb,samaitra/influxdb,luciotorre/influxdb,vladlopes/influxdb,kingland/influxdb,GoIncremental/influxdb,chenziliang/influxdb,jportoles/influxdb092,apigee/influxdb,pablolmiranda/influxdb,bspline/influxdb,daachi/influxdb,IMCG/InfluxDB,bluebreezecf/influxdb,slachiewicz/influxdb,timraymond/influxdb,egymgmbh/influxdb,fg2it/influxdb,bspline/influxdb,CVTJNII/influxdb-tjnii,imcom/influxdb,daachi/influxdb,roobert/influxdb,runner-mei/influxdb,toorop/influxdb,trigrass2/influxdb,nickrobinson/influxdb,mre/influxdb,ninjasphere/influxdb,eminden/influxdb,Venu4thFeb/influxdb,cnelissen/influxdb,Tony133/influxdb,no2key/influxdb,fxstein/influxdb,nickrobinson/influxdb,mmaul/influxdb,pablolmiranda/influxdb,kingland/influxdb,pkittenis/influxdb,dneuman64/influxdb,Tony133/influxdb,pdf/influxdb,kingland/influxdb,tjyang/influxdb,timraymond/influxdb,bspline/influxdb,archsaber/influxdb,tuxmonteiro/influxdb,mre/influxdb,nickscript0/influxdb,ninjasphere/influxdb,pdf/influxdb,bspline/influxdb,mre/influxdb,vladlopes/influxdb,Mindera/influxdb,nooproblem/influxdb,chenziliang/influxdb,apriendeau/influxdb,fxstein/influxdb,michaelsproul/influxdb,pkittenis/influxdb,Tony133/influxdb,influxdb/influxdb,mre/influxdb,Mindera/influxdb,tjyang/influxdb,sudabon/influxdb,linearb/influxdb,lenko-d/influxdb,nckturner/influxdb,Mindera/influxdb,eminden/influxdb,n1tr0g/influxdb,imcom/influxdb,chenziliang/influxdb,Yong-Lee/influxdb,arussellsaw/influxdb,apriendeau/influxdb,jgeiger/influxdb,mmaul/influxdb,jonseymour/influxdb,ASAPPinc/influxdb,toorop/influxdb,opavader/influxdb,otoolep/influxdb,lgpeterson/influxdb,tommymei/influxdb,DanielMorsing/influxdb,ezotrank/influxdb,li-ang/influxdb,pdf/influxdb,apigee/influxdb,dneuman64/influxdb,mash0304/influxdb,no2key/influxdb,IMCG/InfluxDB,trigrass2/influxdb,lenko-d/influxdb,Sotfo/influxdb,no2key/influxdb,IMCG/InfluxDB,influxdb/influxdb,atyenoria/influxdb,mash0304/influxdb,mvadu/influxdb,GoIncremental/influxdb,mark-rushakoff/influxdb,arussellsaw/influxdb,otoolep/influxdb,evanphx/influxdb,jportoles/influxdb092,samaitra/influxdb,otoolep/influxdb,ezotrank/influxdb,no2key/influxdb,imcom/influxdb,chenziliang/influxdb,atyenoria/influxdb,GoIncremental/influxdb,ASAPPinc/influxdb,luciotorre/influxdb,egymgmbh/influxdb,Ancillas/influxdb,stvnwrgs/influxdb,alexiri/influxdb,josephcopenhaver/influxdb,influxdb/influxdb,trigrass2/influxdb,mmaul/influxdb,atyenoria/influxdb,lgpeterson/influxdb,imcom/influxdb,ASAPPinc/influxdb,joaopedrotaveira/influxdb,jipperinbham/influxdb,slachiewicz/influxdb,linfangrong/influxdb,wxdublin/influxdb,mark-rushakoff/influxdb,bluebreezecf/influxdb,m4ce/influxdb,fg2it/influxdb,marcosnils/influxdb,jonseymour/influxdb,otoolep/influxdb,apriendeau/influxdb,pdf/influxdb,mnuessler/influxdb,runner-mei/influxdb,Ancillas/influxdb,nickrobinson/influxdb,brunoqc/influxdb,fg2it/influxdb,jportoles/influxdb092,imcom/influxdb,timraymond/influxdb,opavader/influxdb,tommymei/influxdb,jipperinbham/influxdb,slavau/influxdb,lgpeterson/influxdb,pkittenis/influxdb,samaitra/influxdb,jgeiger/influxdb,linearb/influxdb,jportoles/influxdb092,vladlopes/influxdb,pkittenis/influxdb,fg2it/influxdb,mvadu/influxdb,alexiri/influxdb,trigrass2/influxdb,wxdublin/influxdb,Mindera/influxdb,paulstuart/influxdb,rnubel/influxdb,wxdublin/influxdb,daachi/influxdb,runcom/influxdb,roobert/influxdb,slavau/influxdb,egymgmbh/influxdb,archsaber/influxdb,otoolep/influxdb,dneuman64/influxdb,nickscript0/influxdb,paulstuart/influxdb,mnuessler/influxdb,michaelsproul/influxdb,Yong-Lee/influxdb,stvnwrgs/influxdb,slachiewicz/influxdb,haim0n/influxdb,linearb/influxdb,michaelsproul/influxdb,Yong-Lee/influxdb,mark-rushakoff/influxdb,paulstuart/influxdb,Tony133/influxdb,sudabon/influxdb,cnelissen/influxdb,haim0n/influxdb,nckturner/influxdb,influxdb/influxdb,IMCG/InfluxDB,linearb/in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