Revert "Extract helper method"

This reverts commit e3d1d0b.

packages/publications/src/Commands/ValidatePublicationsCommand.php

@@ -105,7 +105,10 @@ protected function getPublicationTypesToValidate(): Collection
         $name = $this->argument('publicationType');
 
         if (filled($name)) {
-            return $this->getPublicationTypeFromArgument($publicationTypes, $name);
+            if (! $publicationTypes->has($name)) {
+                throw new InvalidArgumentException("Publication type [$name] does not exist");
+            }
+            return collect([$name => PublicationType::get($name)]);
         }
 
         if ($publicationTypes->isEmpty()) {
@@ -115,14 +118,6 @@ protected function getPublicationTypesToValidate(): Collection
         return $publicationTypes;
     }
 
-    protected function getPublicationTypeFromArgument(Collection $publicationTypes, string $name): Collection
-    {
-        if (!$publicationTypes->has($name)) {
-            throw new InvalidArgumentException("Publication type [$name] does not exist");
-        }
-        return collect([$name => PublicationType::get($name)]);
-    }
-
     protected function displayResults(): void
     {
         foreach ($this->results as $publicationTypeName => $publications) {