Suppress errors when checking for the existence of files that might be restricted by open_basedir - should resolve issue #1310

lib/common.php

@@ -192,7 +192,7 @@ $_config_files[] = INSTALLDIR.'/config.php';
 $_have_a_config = false;
 
 foreach ($_config_files as $_config_file) {
-    if (file_exists($_config_file)) {
+    if (@file_exists($_config_file)) {
         include_once($_config_file);
         $_have_a_config = true;
     }

lib/util.php

@@ -966,7 +966,7 @@ function common_root_url($ssl=false)
 function common_good_rand($bytes)
 {
     // XXX: use random.org...?
-    if (file_exists('/dev/urandom')) {
+    if (@file_exists('/dev/urandom')) {
         return common_urandom($bytes);
     } else { // FIXME: this is probably not good enough
         return common_mtrand($bytes);