[gnome-shell] extensionSystem: Catch import errors

[Florian Müllner <fmuellner src gnome org>]

commit d461d02cdcc007138f9d39dc7ca7cd62a38e3607
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed May 17 23:57:18 2017 +0200

    extensionSystem: Catch import errors
    
    While we catch errors that occur when calling init(), enable() or
    disable(), the import itself can throw an exception, for instance
    if the extension imports an unavailable typelib or tries to draw
    in a conflicting library.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781728

 js/ui/extensionSystem.js |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/extensionSystem.js b/js/ui/extensionSystem.js
index fc359e6..f25d63a 100644
--- a/js/ui/extensionSystem.js
+++ b/js/ui/extensionSystem.js
@@ -225,7 +225,12 @@ function initExtension(uuid) {
     let extensionState = null;
 
     ExtensionUtils.installImporter(extension);
-    extensionModule = extension.imports.extension;
+    try {
+        extensionModule = extension.imports.extension;
+    } catch(e) {
+        logExtensionError(uuid, e);
+        return false;
+    }
 
     if (extensionModule.init) {
         try {