Fixed exception on log view. Added availability test for log view.

src/Entity/LogSystem/ElementCreatedLogEntry.php

@@ -36,9 +36,9 @@ class ElementCreatedLogEntry extends AbstractLogEntry
     /**
      * Gets the instock when the part was created.
      *
-     * @return int|null
+     * @return string|null
      */
-    public function getCreationInstockValue(): ?int
+    public function getCreationInstockValue(): ?string
     {
         return $this->extra['i'] ?? null;
     }

tests/ApplicationAvailabilityFunctionalTest.php

@@ -89,6 +89,8 @@ class ApplicationAvailabilityFunctionalTest extends WebTestCase
         //yield ['/tree/device/1'];
         yield ['/tree/devices'];
 
+        yield ['/log/'];
+
         //Typeahead
         yield ['/typeahead/builtInResources/search/DIP8'];
         yield ['/typeahead/tags/search/test'];