Protect against missing hosts_olsr.stable (#523)

files/www/cgi-bin/mesh

@@ -316,6 +316,7 @@ do
 end
 
 -- load the olsr hosts file
+if nixio.fs.stat("/var/run/hosts_olsr.stable") then
     for line in io.lines("/var/run/hosts_olsr.stable")
     do
         local ip, name, originator = line:match("^([%d%.]+)%s+(%S+)%s+%S+%s+(%S+)")
@@ -362,6 +363,7 @@ do
             end
         end
     end
+end
 
 -- discard
 routes = nil

files/www/cgi-bin/status

@@ -58,6 +58,7 @@ function mesh_ip_to_hostnames(ip)
         end
     end
     local hosts = ""
+    if nixio.fs.stat("/var/run/hosts_olsr.stable") then
         for line in io.lines("/var/run/hosts_olsr.stable")
         do
             local host = line:match(pattern)
@@ -65,6 +66,7 @@ function mesh_ip_to_hostnames(ip)
                 hosts = hosts .. " / " .. host
             end
         end
+    end
     return hosts:sub(4, #hosts)
 end
 
@@ -180,6 +182,7 @@ end
 
 local host_total = 0
 local host_nodes = 0
+if nixio.fs.stat("/var/run/hosts_olsr.stable") then
     for line in io.lines("/var/run/hosts_olsr.stable")
     do
         if line:match("^10%.") and not line:match("%smid%d+%.") then
@@ -190,6 +193,7 @@ do
             end
         end
     end
+end
 
 -- post data