Fixed email-cta card being auto-deleted when no content is set

refs https://github.com/TryGhost/Team/issues/928

- it's possible to set a button with no content in the CTA card but the auto-removal when exiting edit mode was only checking for presence of content
- updated to only remove the card when no content, button text, or button url has been set

ghost/admin/lib/koenig-editor/addon/components/koenig-card-email-cta.hbs

@@ -83,12 +83,14 @@
         <div class="gh-email-cta-segment-indicator">
             <p>{{capitalize this.selectedSegment.name}}</p>
         </div>
-        <div class="relative">
-            <p>{{{this.formattedHtml}}}</p>
-            <div class="koenig-card-click-overlay"></div>
-        </div>
+        {{#if @payload.html}}
+            <div class="relative">
+                <p>{{{this.formattedHtml}}}</p>
+                <div class="koenig-card-click-overlay"></div>
+            </div>
+        {{/if}}
         {{#if (and @payload.buttonText @payload.buttonUrl)}}
-            <div class="mt6"><a class="gh-btn gh-btn-accent" href="javascript:void(0)" data-tooltip={{@payload.buttonUrl}}><span>{{@payload.buttonText}}</span></a></div>
+            <div class="{{if @payload.html "mt6"}}"><a class="gh-btn gh-btn-accent" href="javascript:void(0)" data-tooltip={{@payload.buttonUrl}}><span>{{@payload.buttonText}}</span></a></div>
         {{/if}}
     {{/if}}
 </KoenigCard>

ghost/admin/lib/koenig-editor/addon/components/koenig-card-email-cta.js

@@ -100,7 +100,9 @@ export default class KoenigCardEmailCtaComponent extends Component {
 
     @action
     leaveEditMode() {
-        if (isBlank(this.args.payload.html)) {
+        const {html, buttonText, buttonUrl} = this.args.payload;
+
+        if (isBlank(html) && isBlank(buttonText) && isBlank(buttonUrl)) {
             // afterRender is required to avoid double modification of `isSelected`
             // TODO: see if there's a way to avoid afterRender
             run.scheduleOnce('afterRender', this, this.args.deleteCard);

ghost/admin/lib/koenig-editor/addon/options/cards.js

@@ -47,7 +47,9 @@ export default [
     createComponentCard('markdown', {deleteIfEmpty: 'payload.markdown'}),
     createComponentCard('gallery', {hasEditMode: false}),
     createComponentCard('email', {deleteIfEmpty: 'payload.html'}),
-    createComponentCard('email-cta', {deleteIfEmpty: 'payload.html'}),
+    createComponentCard('email-cta', {deleteIfEmpty(card) {
+        return !card.payload.html && !card.payload.buttonText && !card.payload.buttonUrl;
+    }}),
     createComponentCard('paywall', {hasEditMode: false, selectAfterInsert: false})
 ];