MOBILE-2675 url: Ignore error when fetching moddule in offline

src/addon/mod/url/providers/module-handler.ts

@@ -140,6 +140,9 @@ export class AddonModUrlModuleHandler implements CoreCourseModuleHandler {
         return this.courseProvider.loadModuleContents(module, courseId, undefined, false, false, undefined, this.modName)
                 .then(() => {
             return !(module.contents && module.contents[0] && module.contents[0].fileurl);
+        }).catch(() => {
+            // Module contents could not be loaded, most probably device is offline.
+            return true;
         });
     }