#213172 by skiquel: let color module run properly without a base image

modules/color/color.module

@@ -317,8 +317,10 @@ function color_scheme_form_submit($form, &$form_state) {
     $paths['files'][] = $paths['target'] . $base;
   }
 
-  // Render new images.
-  _color_render_images($theme, $info, $paths, $palette);
+  // Render new images, if image provided.
+  if ($info['base_image']) {
+    _color_render_images($theme, $info, $paths, $palette);
+  }
 
   // Rewrite theme stylesheets.
   $css = array();