Hide the phone placeholder on contact and imprint

An empty kontakt.phone now hides the whole 'Lieber anrufen' block and the
phone line in the imprint instead of showing a red placeholder. Setting a
number brings both back.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/pages/impressum.astro

@@ -18,10 +18,8 @@ const { impressum, kontakt } = site;
 
       <h2>Kontakt</h2>
       <p>
-        E-Mail: <a href={`mailto:${kontakt.email}`}>{kontakt.email}</a><br />
-        Telefon: {kontakt.phone
-          ? kontakt.phone
-          : <span class="placeholder">[Telefonnummer eintragen]</span>}
+        E-Mail: <a href={`mailto:${kontakt.email}`}>{kontakt.email}</a>
+        {kontakt.phone && (<><br />Telefon: {kontakt.phone}</>)}
       </p>
 
       <h2>Umsatzsteuer-ID</h2>

src/pages/index.astro

@@ -277,13 +277,13 @@ const findItem = (src: string) =>
         <h2>{kontakt.title}</h2>
         <p class="text-lead" set:html={rich(kontakt.lead)} />
 
+        {kontakt.phone && (
           <div class="contact-detail">
             <p class="contact-label">Lieber anrufen</p>
-          <p class={kontakt.phone ? 'contact-phone' : 'placeholder contact-phone'}>
-            {kontakt.phone || '[Telefonnummer eintragen]'}
-          </p>
+            <p class="contact-phone">{kontakt.phone}</p>
             {kontakt.hours && <p class="contact-hours">{kontakt.hours}</p>}
           </div>
+        )}
 
         <div class="contact-detail">
           <p class="contact-label">Oder direkt schreiben</p>