Fix php warning + undefined var notice

includes/system.php

@@ -125,7 +125,11 @@ function DisplaySystem(&$extraFooterScripts)
     exec('cat '. RASPI_LIGHTTPD_CONFIG, $return);
     $conf = ParseConfig($return);
     $serverPort = $conf['server.port'];
+    if (isset($conf['server.bind'])) {
         $serverBind = str_replace('"', '',$conf['server.bind']);
+    } else {
+        $serverBind = '';
+    }
 
     // define locales
     $arrLocales = getLocales();

includes/wifi_functions.php

@@ -77,6 +77,7 @@ function nearbyWifiStations(&$networks, $cached = true)
         if ( isset($lastnet['index']) ) $index = $lastnet['index'] + 1;
     }
 
+    if (is_array($scan_results)) {
         array_shift($scan_results);
         foreach ($scan_results as $network) {
             $arrNetwork = preg_split("/[\t]+/", $network);  // split result into array
@@ -119,6 +120,7 @@ function nearbyWifiStations(&$networks, $cached = true)
             }
         }
     }
+}
 
 function connectedWifiStations(&$networks)
 {