don't allow final template to be deleted in empty note type

aqt/clayout.py

@@ -106,6 +106,8 @@ class CardLayout(QDialog):
         self.tabs.addTab(w, t['name'])
 
     def onRemoveTab(self, idx):
+        if len(self.model['tmpls']) < 2:
+            return showInfo(_("At least one template is required."))
         if not askUser(_("Remove all cards of this type?")):
             return
         if not self.mm.remTemplate(self.model, self.cards[idx].template()):

designer/debug.ui

@@ -31,7 +31,7 @@
    <item>
     <widget class="QPlainTextEdit" name="log">
      <property name="focusPolicy">
-      <enum>Qt::NoFocus</enum>
+      <enum>Qt::ClickFocus</enum>
      </property>
      <property name="readOnly">
       <bool>true</bool>