Bugs fixed:

* #426438 by brmassa: If the chart data is missing the provider file, it must not end as an error

charts.module

@@ -71,9 +71,13 @@ function charts_chart(&$data) {
   // Get the information about chart modules
   $chart_provider = module_invoke_all('charts_info');
 
-  // Include the file that has the rendering function
-  include_once $chart_provider[$data['#plugin']]['file'];
-  if ($func = $chart_provider[$data['#plugin']]['render']) {
+  if (isset($chart_provider[$data['#plugin']]['file'])
+      and is_file($chart_provider[$data['#plugin']]['file'])
+      and $func = $chart_provider[$data['#plugin']]['render']) {
+
+    // Include the file that has the rendering function
+    include_once $chart_provider[$data['#plugin']]['file'];
+
     // Using the filter's rendering function, print the chart
     return $func($data);
   }
@@ -172,4 +176,4 @@ function charts_views_api() {
     'api' => 2,
     'path' => drupal_get_path('module', 'charts') .'/views',
   );
-}
+}
\ No newline at end of file