troubleshooting taskd docker control buttons

luasrc/view/tasks/docker.htm

@@ -17,7 +17,8 @@ if not task_running then
     <%
     local util  = require "luci.util"
     local container_status = util.trim(util.exec(self.script_path.." status"))
-    local container_install = not string.match(container_status, " is not installed$")
+    local container_status_lower = string.lower(util.trim(util.exec(self.script_path.." status")))
+    local container_install = not string.match(container_status_lower, " is not installed$")
     local container_running = string.match(string.lower(container_status), "^up .* (seconds|minutes|hours)")
     if container_install then
     -%>