fix: 🐛 Fix new target navigation issue (#1070)

Fix issue where trying to leave the new target form via the discard
changes dialog would cause the user to have to refresh screen.

✅ Closes: ICU-4047

ui/admin/app/components/form/target/index.hbs

@@ -1,7 +1,9 @@
-{{component
-  (concat 'form/target/' @model.type)
-  model=@model
-  submit=@submit
-  cancel=@cancel
-  changeType=@changeType
-}}
+{{#if @model.type}}
+  {{component
+    (concat 'form/target/' @model.type)
+    model=@model
+    submit=@submit
+    cancel=@cancel
+    changeType=@changeType
+  }}
+{{/if}}