setup - Add defensive null check in case bios date is null (#71452)

changelogs/fragments/win_setup-bios.yml

@@ -0,0 +1,2 @@
+bugfixes:
+- setup - Add a null check for ``Win32_Bios.ReleaseData`` to avoid a failure when that value is not set - https://github.com/ansible/ansible/issues/69736

lib/ansible/modules/windows/setup.ps1

@@ -158,12 +158,16 @@ if($gather_subset.Contains('bios')) {
     $win32_bios = Get-LazyCimInstance Win32_Bios
     $win32_cs = Get-LazyCimInstance Win32_ComputerSystem
     $ansible_facts += @{
-        ansible_bios_date = $win32_bios.ReleaseDate.ToString("MM/dd/yyyy")
+        ansible_bios_date = $null
         ansible_bios_version = $win32_bios.SMBIOSBIOSVersion
         ansible_product_name = $win32_cs.Model.Trim()
         ansible_product_serial = $win32_bios.SerialNumber
         # ansible_product_version = ([string] $win32_cs.SystemFamily)
     }
+
+    if ($win32_bios.ReleaseDate) {
+        $ansible_facts.ansible_bios_date = $win32_bios.ReleaseDate.ToString("MM/dd/yyyy")
+    }
 }
 
 if($gather_subset.Contains('date_time')) {