Small UI fix, added contacts button (for now disabled).

src/webview/index.html

@@ -110,6 +110,7 @@
                     <button disabled id="owners_button" class="button is-info is-light" onclick="showOwnersDialog();" title="You can change domain owners. Leave empty to be yours only.">
                         <span>Set owners</span><span id="owners_count" class="tag is-info is-hidden ml-2">0</span>
                     </button>
+                    <button disabled id="add_contacts_button" class="button is-info is-light" onclick="showContactsDialog();" title="You can add contact information to your domain, if you wish">Set contacts</button>
                     <button id="new_domain_button" class="button is-info" onclick="createDomain();" title="Start mining">Mine domain</button>
                 </div>
             </div>

src/webview/scripts.js

@@ -215,6 +215,10 @@ function recordOkay(okay) {
 }
 
 function createDomain() {
+    if (typeof currentZone == 'undefined') {
+        showWarning("Select a domain zone first");
+        return;
+    }
     var new_domain = document.getElementById("new_domain").value.toLowerCase();
     var domain = new_domain + "." + currentZone.name;
     var data = {};