Remove defaults for required vars

roles/partitioning/defaults/main.yml

@@ -1,6 +1,5 @@
 ---
 partitioning_luks_enabled: "{{ luks_enabled | bool }}"
-partitioning_luks_passphrase: "{{ luks_passphrase }}"
 partitioning_luks_mapper_name: "{{ luks_mapper_name }}"
 partitioning_luks_type: "{{ luks_type }}"
 partitioning_luks_cipher: "{{ luks_cipher }}"
@@ -112,12 +111,20 @@ partitioning_root_device: >-
   }}
 partitioning_vm_size_effective: >-
   {{
-    (partitioning_vm_size if (partitioning_vm_size | float) > 0 else vm_size)
+    (
+      partitioning_vm_size
+      if (partitioning_vm_size | float) > 0
+      else (vm_size if vm_size is defined else 0)
+    )
     | float
   }}
 partitioning_vm_memory_effective: >-
   {{
-    (partitioning_vm_memory if (partitioning_vm_memory | float) > 0 else vm_memory)
+    (
+      partitioning_vm_memory
+      if (partitioning_vm_memory | float) > 0
+      else (vm_memory if vm_memory is defined else 0)
+    )
     | float
   }}
 partitioning_swap_size_gb: >-