Move partitioning LUKS defaults into role

roles/partitioning/tasks/main.yml

@@ -1,7 +1,7 @@
 ---
 - name: Detect system memory for swap sizing
   when:
-    - (partitioning_vm_memory | float) <= 0
+    - partitioning_vm_memory is not defined or (partitioning_vm_memory | float) <= 0
     - vm_memory is not defined or (vm_memory | float) <= 0
   block:
     - name: Read system memory
@@ -17,7 +17,7 @@
 - name: Set partitioning vm_size for physical installs
   when:
     - install_type == "physical"
-    - (partitioning_vm_size | float) <= 0
+    - partitioning_vm_size is not defined or (partitioning_vm_size | float) <= 0
     - vm_size is not defined or (vm_size | float) <= 0
     - install_drive | length > 0
   block:
@@ -157,14 +157,7 @@
   when: partitioning_luks_enabled | bool
   vars:
     partitioning_luks_passphrase_effective: >-
-      {{
-        (
-          partitioning_luks_passphrase
-          if partitioning_luks_passphrase is defined
-          else (luks_passphrase if luks_passphrase is defined else '')
-        )
-        | string
-      }}
+      {{ partitioning_luks_passphrase | string }}
   block:
     - name: Validate LUKS passphrase
       ansible.builtin.assert: