Clean up based on notes. Adding some JSON event config options for presenter agree and presenter bio.

src/routes/events_pres_mgmt/presenter_view.svelte

@@ -330,7 +330,7 @@ $: if ($lq__event_presenter_obj) {
             <!-- ) -->
             (Not signed in as presenter)
         {:else}
-            ({@html $lq__event_presenter_obj.email ?? 'email '+ae_snip.html__not_set})
+            ({@html ($lq__event_presenter_obj?.email && $lq__event_presenter_obj?.email.length) ? $lq__event_presenter_obj?.email : 'email '+ae_snip.html__not_set})
         {/if}
     </span>
 
@@ -1350,7 +1350,9 @@ $: if ($lq__event_presenter_obj) {
     </li>
 
     <!-- The presenters biography. There should be a character counter. -->
-    <li>
+    <li
+        class:hidden={!$lq__event_obj?.cfg_json?.presenter_bio}
+        >
         <div class="label event_presenter__biography required space-y-4">
             <button
                 type="button"