Fix unresponsive edit message

A bug in the handling of custom data caused an error
that prevented the wizard from opening.

src/routes/console/project-[project]/messaging/createMessageDropdown.svelte

@@ -56,7 +56,8 @@
                             $messageParams[$providerType] = {
                                 ...common,
                                 title: '',
-                                body: ''
+                                body: '',
+                                data: [['', '']]
                             };
                             break;
                     }

src/routes/console/project-[project]/messaging/message-[message]/+page.svelte

@@ -84,7 +84,9 @@
                     Object.entries(data['data'] ?? {}).forEach(([key, value]) => {
                         dataEntries.push([key, value.toString()]);
                     });
-                    $messageParams[$providerType]['data'] = dataEntries || [['', '']];
+                    $messageParams[$providerType]['data'] = dataEntries.length
+                        ? dataEntries
+                        : [['', '']];
                 }
                 break;
         }

src/routes/console/project-[project]/messaging/wizard/pushFormList.svelte

@@ -54,7 +54,7 @@
     let customData: [string, string][] = [];
 
     onMount(() => {
-        $messageParams[MessagingProviderType.Push].data = customData || [['', '']];
+        customData = $messageParams[MessagingProviderType.Push].data;
     });
 
     async function sendTestMessage() {