Changed checks for `command` attribute in `run_through_shell` and `execute`.
Changed checks for `command` attribute in `run_through_shell` and `execute`.

m45t3r/i3pystatus,schroeji/i3pystatus,fmarchenko/i3pystatus,yang-ling/i3pystatus,yang-ling/i3pystatus,eBrnd/i3pystatus,drwahl/i3pystatus,Arvedui/i3pystatus,ncoop/i3pystatus,teto/i3pystatus,ncoop/i3pystatus,richese/i3pystatus,teto/i3pystatus,asmikhailov/i3pystatus,richese/i3pystatus,eBrnd/i3pystatus,facetoe/i3pystatus,enkore/i3pystatus,enkore/i3pystatus,facetoe/i3pystatus,schroeji/i3pystatus,Arvedui/i3pystatus,fmarchenko/i3pystatus,asmikhailov/i3pystatus,drwahl/i3pystatus,juliushaertl/i3pystatus,m45t3r/i3pystatus,juliushaertl/i3pystatus