graph.php: fix undefined index 'type' in $plugin_json[$type]

When type wasn't set in the plugin json, a "PHP Notice:  Undefined index"
would pop up. Just default to 'default' when type isn't set.

Closes #76 #77

1 files changed, 3 insertions, 0 deletions

diff --git a/graph.php b/graph.php
index fbc93a7..55be9e9 100644
--- a/graph.php
+++ b/graph.php
@@ -35,6 +35,9 @@ if (file_exists('plugin/'.$plugin.'.json')) {
                 error_log('CGP Error: invalid json in plugin/'.$plugin.'.json');
 }
 
+if (!isset($plugin_json[$type]['type']))
+        $plugin_json[$type]['type'] = 'default';
+
 switch ($plugin_json[$type]['type']) {
         case 'stacked':
                 require_once 'type/GenericStacked.class.php';