From: Marco Trevisan (Treviño) <mail@3v1n0.net>
Date: Wed, 15 Aug 2018 01:33:13 +0000 (+0200)
Subject: js/main: Throw error if no valid default stylesheet is found
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js/main: Throw error if no valid default stylesheet is found

Throw an error using an informative message in case a mode uses a stylesheet
that can't be loaded, instead of crashing later because the theming can't be
properly computed, and thus the minimum size of the actors.
---

diff --git a/js/ui/main.js b/js/ui/main.js
index e107de744..9e7ce8706 100644
--- a/js/ui/main.js
+++ b/js/ui/main.js
@@ -343,6 +343,9 @@ function loadTheme() {
     let theme = new St.Theme ({ application_stylesheet: _cssStylesheet,
                                 default_stylesheet: _defaultCssStylesheet });
 
+    if (theme.default_stylesheet == null)
+        throw new Error("No valid stylesheet found for '%s'".format(sessionMode.stylesheetName));
+
     if (previousTheme) {
         let customStylesheets = previousTheme.get_custom_stylesheets();