[Shropshire] Add relevant messaging to the no_asset_message

As locking the page from progressing is done using the standard
no asset process, update the no_asset_message attribute to contain
the same informative messaging as at the continue button.

Also solves issues of informative messaging not appearing on
the subcategory screen if you get to subcategory and then
choose a parish light which would mean there was no explanation
on the page as to why you were blocked from going forward.

mysociety/societyworks#3996

web/cobrands/fixmystreet-uk-councils/assets.js

@@ -1380,6 +1380,10 @@ fixmystreet.assets.shropshire.streetlight_stylemap = new OpenLayers.StyleMap({
 
 fixmystreet.assets.shropshire.streetlight_found = function(asset) {
     var controller_fn = shropshire_light(asset) ? 'asset_found' : 'asset_not_found';
+    if (asset.attributes.OWNER) {
+        this.fixmystreet.no_asset_msg_id = '#sl-owner-' + asset.attributes.FEAT_LABEL + asset.attributes.OWNER.replace(/[^a-zA-Z0-9]/g, '');
+        this.fixmystreet.no_asset_message = fixmystreet.assets.shropshire.streetlight_asset_message(asset);
+    }
     fixmystreet.message_controller[controller_fn].call(this);
     fixmystreet.assets.named_select_action_found.call(this, asset);
 };