resolve php warning/notices when plugin doesn't exist

For example when a non existing plugin is defined in $CONFIG['overview'] it
causes a lot of php warnings/notices.

1 files changed, 5 insertions, 0 deletions

diff --git a/inc/collectd.inc.php b/inc/collectd.inc.php
index 3467667..99ffdd1 100644
--- a/inc/collectd.inc.php
+++ b/inc/collectd.inc.php
@@ -54,6 +54,7 @@ function collectd_plugindata($host, $plugin=NULL) {
 
         # only return data about one plugin
         if (!is_null($plugin)) {
+                $pdata = array();
                 foreach($data as $item) {
                         if ($item['p'] == $plugin)
                                 $pdata[] = $item;
@@ -113,6 +114,7 @@ function collectd_plugindetail($host, $plugin, $detail, $where=NULL) {
 function group_plugindata($plugindata) {
         global $CONFIG;
 
+        $data = array();
         # type instances should be grouped in 1 graph
         foreach ($plugindata as $item) {
                 # backwards compatibility
@@ -129,6 +131,9 @@ function group_plugindata($plugindata) {
 }
 
 function plugin_sort($data) {
+        if (empty($data))
+                return $data;
+
         foreach ($data as $key => $row) {
                 $pi[$key] = (isset($row['pi'])) ? $row['pi'] : null;
                 $c[$key]  = (isset($row['c']))  ? $row['c'] : null;