Guard missing admin modal status element

admin/public/app.js

@@ -104,12 +104,18 @@ function clearStatus(){
 }
 
 function showDistributionEditorStatus(message, tone = 'info'){
+    if(distributionEditorStatus == null){
+        return
+    }
     distributionEditorStatus.hidden = false
     distributionEditorStatus.dataset.tone = tone
     distributionEditorStatus.textContent = message
 }
 
 function clearDistributionEditorStatus(){
+    if(distributionEditorStatus == null){
+        return
+    }
     distributionEditorStatus.hidden = true
     distributionEditorStatus.textContent = ''
     delete distributionEditorStatus.dataset.tone