[gnome-web-wppo] avoid error when analysing dynamic PO files (which doesn't contain bloginfo tags)

[Vinicius Scopel Depizzol <vdepizzol src gnome org>]

commit 6353dea451fdd74dfcf7d78a8c7f8f234b786b14
Author: Vinicius Depizzol <vdepizzol gmail com>
Date:   Sat Mar 10 18:04:45 2012 -0300

    avoid error when analysing dynamic PO files (which doesn't contain bloginfo tags)

 backend.php |   22 ++++++++++++----------
 1 files changed, 12 insertions(+), 10 deletions(-)
---
diff --git a/backend.php b/backend.php
index eba4040..e60576a 100644
--- a/backend.php
+++ b/backend.php
@@ -230,16 +230,18 @@ function wppo_check_for_po_changes($force = false, $coverage = array('dynamic',
                  */
                 $bloginfo = $dom->getElementsByTagName('bloginfo');
                 
-                foreach ($bloginfo->item(0)->childNodes as $option) {
-                    if (get_class($option) == 'DOMElement') {
-                        $option_node['option_name'] = $option->nodeName;
-                        $option_node['lang'] = $lang;
-                        $option_node['translated_value'] = $option->nodeValue;
-                        
-                        if (!$wpdb->get_row("SELECT option_name FROM ".WPPO_PREFIX."options WHERE option_name = '". mysql_real_escape_string($option_node['option_name']) ."' AND lang = '". mysql_real_escape_string($lang) ."'")) {
-                            $wpdb->insert(WPPO_PREFIX."options", $option_node);
-                        } else {
-                            $wpdb->update(WPPO_PREFIX."options", $option_node, array('option_name' => $option_node['options_name'], 'lang' => $lang));
+                if ($bloginfo->item(0) != null) {
+                    foreach ($bloginfo->item(0)->childNodes as $option) {
+                        if (get_class($option) == 'DOMElement') {
+                            $option_node['option_name'] = $option->nodeName;
+                            $option_node['lang'] = $lang;
+                            $option_node['translated_value'] = $option->nodeValue;
+                            
+                            if (!$wpdb->get_row("SELECT option_name FROM ".WPPO_PREFIX."options WHERE option_name = '". mysql_real_escape_string($option_node['option_name']) ."' AND lang = '". mysql_real_escape_string($lang) ."'")) {
+                                $wpdb->insert(WPPO_PREFIX."options", $option_node);
+                            } else {
+                                $wpdb->update(WPPO_PREFIX."options", $option_node, array('option_name' => $option_node['options_name'], 'lang' => $lang));
+                            }
                         }
                     }
                 }