Fix condition for dropping empty memory series.
Fix condition for dropping empty memory series.

alileza/prometheus,Dieterbe/prometheus,dmilstein/prometheus,Colstuwjx/prometheus,msiebuhr/prometheus,slok/prometheus,q3k/prometheus,jmcfarlane/prometheus,Stackdriver/stackdriver-prometheus,fabxc/prometheus,PrFalken/prometheus,brancz/prometheus,fabxc/prometheus,smyrman/prometheus,dln/prometheus,wndhydrnt/prometheus,hustbill/prometheus,gcnonato/prometheus,eliothedeman/prometheus,jimmidyson/prometheus,bluecmd/prometheus,robbiet480/prometheus,brancz/prometheus,thachmai/prometheus,robbiet480/prometheus,datajet-io/prometheus,robbiet480/prometheus,AlekSi/prometheus,q3k/prometheus,trigrass2/prometheus,dpatel06/prometheus,SaltedMan/prometheus-annotated,dpatel06/prometheus,mrwacky42/prometheus,dalanlan/prometheus,GoogleCloudPlatform/prometheus,gesellix/prometheus,gottwald/prometheus,mrwacky42/prometheus,adamron1/prometheus,slok/prometheus,rajthilakmca/prometheus,Colstuwjx/prometheus,fabric8io/prometheus,yanghongkjxy/prometheus,nicr9/prometheus,ton31337/prometheus,kangwoo/prometheus,gesellix/prometheus,prometheus/prometheus,prometheus/prometheus,ton31337/prometheus,cit-lab/prometheus,amorken/prometheus,hustbill/prometheus,JavierZunzunegui/prometheus,alileza/prometheus,bluecmd/prometheus,abhishekamralkar/prometheus,amorken/prometheus,jbdalido/prometheus,trigrass2/prometheus,tattsun/prometheus,eliothedeman/prometheus,q3k/prometheus,gesellix/prometheus,wxdublin/prometheus,Stackdriver/stackdriver-prometheus,RobertKielty/prometheus,q3k/prometheus,fabric8io/prometheus,sudhi-vm/prometheus,rajthilakmca/prometheus,wxdublin/prometheus,keegancsmith/prometheus,rajthilakmca/prometheus,alileza/prometheus,brancz/prometheus,agaoglu/prometheus,SaltedMan/prometheus-annotated,dpatel06/prometheus,GoogleCloudPlatform/prometheus,dmilstein/prometheus,thachmai/prometheus,GoogleCloudPlatform/prometheus,wrouesnel/prometheus,bluecmd/prometheus,gottwald/prometheus,brian-brazil/prometheus,yanghongkjxy/prometheus,jimmidyson/prometheus,abhishekamralkar/prometheus,kzittritsch/prometheus,flier/prometheus,fabxc/prometheus,eliothedeman/prometheus,AlekSi/prometheus,dln/prometheus,gottwald/prometheus,Dieterbe/prometheus,justintung/prometheus,abhishekamralkar/prometheus,eliothedeman/prometheus,gcnonato/prometheus,mtanda/prometheus,datajet-io/prometheus,cit-lab/prometheus,agaoglu/prometheus,jmcfarlane/prometheus,thachmai/prometheus,iksaif/prometheus,hustbill/prometheus,wrouesnel/prometheus,kzittritsch/prometheus,sudhi-vm/prometheus,adamron1/prometheus,gottwald/prometheus,jbdalido/prometheus,slok/prometheus,Conorbro/prometheus,robbiet480/prometheus,prasincs/prometheus,laushinka/prometheus,gcnonato/prometheus,keegancsmith/prometheus,JavierZunzunegui/prometheus,keegancsmith/prometheus,PrFalken/prometheus,amorken/prometheus,agaoglu/prometheus,Colstuwjx/prometheus,kangwoo/prometheus,cit-lab/prometheus,cit-lab/prometheus,dsymonds/prometheus,tattsun/prometheus,iksaif/prometheus,msiebuhr/prometheus,RobertKielty/prometheus,wxdublin/prometheus,kzittritsch/prometheus,iksaif/prometheus,Colstuwjx/prometheus,kangwoo/prometheus,SaltedMan/prometheus-annotated,thachmai/prometheus,smyrman/prometheus,justintung/prometheus,sudhi-vm/prometheus,bluecmd/prometheus,prasincs/prometheus,trigrass2/prometheus,wndhydrnt/prometheus,yanghongkjxy/prometheus,Conorbro/prometheus,tomwilkie/prometheus,Gouthamve/prometheus,prometheus/prometheus,dsymonds/prometheus,gcnonato/prometheus,dalanlan/prometheus,Stackdriver/stackdriver-prometheus,sudhi-vm/prometheus,PrFalken/prometheus,trigrass2/prometheus,kangwoo/prometheus,laushinka/prometheus,Gouthamve/prometheus,wrouesnel/prometheus,prometheus/prometheus,tattsun/prometheus,nicr9/prometheus,tomwilkie/prometheus,Stackdriver/stackdriver-prometheus,prasincs/prometheus,PrFalken/prometheus,RobertKielty/prometheus,mrwacky42/prometheus,justintung/prometheus,justintung/prometheus,GoogleCloudPlatform/prometheus,keegancsmith/prometheus,Gouthamve/prometheus,dln/prometheus,mtanda/prometheus,mtanda/prometheus,fabxc/prometheus,jmcfarlane/prometheus,kzittritsch/prometheus,mtanda/prometheus,Dieterbe/prometheus,alileza/prometheus,keegancsmith/prometheus,jimmidyson/prometheus,brancz/prometheus,datajet-io/prometheus,tattsun/prometheus,SaltedMan/prometheus-annotated,iksaif/prometheus,brian-brazil/prometheus,ton31337/prometheus,datajet-io/prometheus,laushinka/prometheus,dmilstein/prometheus,jmcfarlane/prometheus,jbdalido/prometheus,tomwilkie/prometheus,hustbill/prometheus,JavierZunzunegui/prometheus,msiebuhr/prometheus,Conorbro/prometheus,agaoglu/prometheus,GoogleCloudPlatform/prometheus,fabric8io/prometheus,smyrman/prometheus,wndhydrnt/prometheus,alileza/prometheus,JavierZunzunegui/prometheus,Conorbro/prometheus,yanghongkjxy/prometheus,slok/prometheus,brian-brazil/prometheus,flier/prometheus,prasincs/prometheus,ton31337/prometheus,adamron1/prometheus,smyrman/prometheus,RobertKielty/prometheus,abhishekamralkar/prometheus,wrouesnel/prometheus,adamron1/prometheus,jbdalido/prometheus,dln/prometheus,rajthilakmca/prometheus,flier/prometheus,msiebuhr/prometheus,gesellix/prometheus,AlekSi/prometheus,prometheus/prometheus,dsymonds/prometheus,dalanlan/prometheus,fabric8io/prometheus,amorken/prometheus,tomwilkie/prometheus,Gouthamve/prometheus,dsymonds/prometheus,laushinka/prometheus,nicr9/prometheus,dmilstein/prometheus,AlekSi/prometheus