Thanks, ronschi, this works perfect for my installed WP too!
I expect your code will be included in future versions. wp-cli is widely deployed. I saved it as a patch.
--- wp-content/themes/parabola/includes/theme-styles.php 2017-01-27 13:07:55.627920010 +0100
+++ wp-content/themes/parabola/includes/theme-styles.php 2017-01-28 05:44:28.000000000 +0100
@@ -10,7 +10,7 @@
function parabola_register_styles() {
global $parabolas;
- foreach ($parabolas as $key => $value) { ${"$key"} = $value ;}
+ if (is_array($parabolas)) {foreach ($parabolas as $key => $value) { ${"$key"} = $value ;}}
wp_register_style( 'parabola-style', get_stylesheet_uri(), NULL, _CRYOUT_THEME_VERSION );