bugfix: aredn sysinfo.json fails with mesh rf off

added json meshrf->status->on/off
fixes:  #317

files/www/cgi-bin/sysinfo.json

@@ -84,11 +84,16 @@ info['node_details']['firmware_mfg']=fw_mfg
 info['node_details']['firmware_version']=getFirmwareVersion()
 
 -- Mesh RF info
-info["meshrf"]={}
-info["meshrf"]["ssid"]=getSSID()
+info['meshrf']={}
 local radio=getMeshRadioDevice()
-info["meshrf"]["channel"]=getChannel(radio)
-info["meshrf"]['chanbw']=getChannelBW(radio)
+if ( radio ~= nill and radio ~= "" ) then
+	info['meshrf']['status']="on"
+	info['meshrf']['ssid']=getSSID()
+	info['meshrf']['channel']=getChannel(radio)
+	info['meshrf']['chanbw']=getChannelBW(radio)
+else
+	info['meshrf']['status']="off"
+end
 
 -- Tunnel info
 info['tunnels']={}
@@ -97,11 +102,11 @@ local tunnel_installed=false
 if file_exists("/usr/sbin/vtund") then
 	tunnel_installed="true"
 end
-info['tunnels']["tunnel_installed"]=tunnel_installed
+info['tunnels']['tunnel_installed']=tunnel_installed
 -- ACTIVE TUNNELS
 local atc=""
 atc=os.capture("ifconfig|grep tun|wc -l")
-info['tunnels']["active_tunnel_count"]=atc:chomp()
+info['tunnels']['active_tunnel_count']=atc:chomp()
 
 -- Location info
 -- LAT/LON
@@ -110,7 +115,7 @@ info['lat']=lat
 info['lon']=lon
 
 -- GRID SQUARE
-info["grid_square"]=getGridSquare()
+info['grid_square']=getGridSquare()
 
 -- UPTIME AND LOADAVGS
 mynix=nixio.sysinfo()
@@ -140,7 +145,7 @@ for pos, i in pairs(ift) do
 		table.insert(tif,nim)
 	end
 end
-info["interfaces"]=tif
+info['interfaces']=tif
 
 -- HOSTS
 if string.find(nixio.getenv("QUERY_STRING"):lower(),"hosts=1") then
@@ -177,7 +182,7 @@ if string.find(nixio.getenv("QUERY_STRING"):lower(),"hosts=1") then
 		host['error']="Cannot read hosts file"
 		table.insert(hosts,host)
 	end
-	info["hosts"]=hosts
+	info['hosts']=hosts
 end
 
 -- SERVICES
@@ -205,7 +210,7 @@ if string.find(nixio.getenv("QUERY_STRING"):lower(),"services=1") then
 		service['error']="Cannot read services file"
 		table.insert(services,service)
 	end
-	info["services"]=services
+	info['services']=services
 end
 
 -- LOCALLY HOSTED SERVICES ONLY