if ($RoleDatacenterIsManagementForest -eq 'True') { if (-not ([String]::IsNullOrEmpty($RoleDatacenterCentralAdminDatabaseServer))) ...

if ($RoleDatacenterIsManagementForest -eq 'True')          {              if (-not ([String]::IsNullOrEmpty($RoleDatacenterCentralAdminDatabaseServer)))              {                set-itemproperty -path HKLM:\Software\Microsoft\ExchangeServer\v15\CentralAdmin -Name "DatabaseServer" -Value $RoleDatacenterCentralAdminDatabaseServer;              }              else              {                Write-ExchangeSetupLog -Warning "Could not identify the Central Admin database server name to store in the registry. The registry may need to be manually set after setup.";              }                  if (-not ([String]::IsNullOrEmpty($RoleDatacenterCentralAdminMirrorDatabaseServer)))              {                set-itemproperty -path HKLM:\Software\Microsoft\ExchangeServer\v15\CentralAdmin -Name "MirrorDatabaseServer" -Value $RoleDatacenterCentralAdminMirrorDatabaseServer;              }              else              {                Write-ExchangeSetupLog -Warning "Could not identify the Central Admin mirror database server name to store in the registry. The registry may need to be manually set after setup.";              }          }