fix: allow omitting datacenter when creating a primary ip (#171)

* omitting "datacenter" if "assignee_id" is passed

* fix: allow omitting the datacenter value when creating a primary IP

---------

Co-authored-by: jo <ljonas@riseup.net>

Author: 83hd4d

hcloud/primary_ips/client.py

@@ -178,7 +178,8 @@ def get_by_name(self, name: str) -> BoundPrimaryIP | None:
     def create(
         self,
         type: str,
-        datacenter: Datacenter | BoundDatacenter,
+        # TODO: Make the datacenter argument optional
+        datacenter: Datacenter | BoundDatacenter | None,
         name: str,
         assignee_type: str | None = "server",
         assignee_id: int | None = None,
@@ -203,10 +204,11 @@ def create(
             "type": type,
             "assignee_type": assignee_type,
             "auto_delete": auto_delete,
-            "datacenter": datacenter.id_or_name,
             "name": name,
         }
-        if assignee_id:
+        if datacenter is not None:
+            data["datacenter"] = datacenter.id_or_name
+        if assignee_id is not None:
             data["assignee_id"] = assignee_id
         if labels is not None:
             data["labels"] = labels