Display error screen when sharing a hidden hash

www/common/sframe-common-outer.js

@@ -274,8 +274,7 @@ define([
 
                 // Hidden hash: can't find the channel in our drives: abort
                 var noPadData = function (err) {
-                    console.error(err);
-                    // XXX Display error screen in inner
+                    sframeChan.event("EV_PAD_NODATA", err);
                 };
                 // Hidden hash: can't find requestd edit URL in our drives: ask
                 var badPadData = function (cb) {

www/common/sframe-common.js

@@ -603,6 +603,10 @@ define([
 
             UI.addTooltips();
 
+            ctx.sframeChan.on("EV_PAD_NODATA", function (err) {
+                UI.errorLoadingScreen(Messages.safeLinks_error);
+            });
+
             ctx.sframeChan.on("EV_PAD_PASSWORD", function (cfg) {
                 UIElements.displayPasswordPrompt(funcs, cfg);
             });