Need help in if and else PowerShell script

$getsecuritygrp = Get-AzNetworkSecurityGroup -Name "NSGName"

$GetRuleConfig = Get-AzNetworkSecurityRuleConfig -Name "RuleName" -NetworkSecurityGroup $getsecuritygrp

if ($GetRuleConfig -eq $null){

 $GetRuleConfig1 = Get-AzNetworkSecurityRuleConfig -Name "RuleName" -NetworkSecurityGroup $getsecuritygrp

  Get-AzNetworkSecurityGroup -Name $getsecuritygrp | Set-AzNetworkSecurityRuleConfig -Name $GetRuleConfig1.name -Protocol $GetRuleConfig1.Protocol -SourcePortRange $GetRuleConfig1.SourcePortRange`
 -DestinationPortRange $GetRuleConfig1.DestinationPortRange -SourceAddressPrefix $GetRuleConfig1.SourceAddressPrefix`
 -DestinationAddressPrefix "*"`
 -Priority $GetRuleConfig1.Priority -Access $GetRuleConfig1.Access`
-Direction $GetRuleConfig1.Direction | Set-AzNetworkSecurityGroup

}

else{
 $GetRuleConfig2 = Get-AzNetworkSecurityRuleConfig -Name "RuleName" -NetworkSecurityGroup $getsecuritygrp}

  Get-AzNetworkSecurityGroup -Name $getsecuritygrp | Set-AzNetworkSecurityRuleConfig -Name BLOCK_INBND_SPAM_IP -Protocol $GetRuleConfig2.Protocol -SourcePortRange $GetRuleConfig2.SourcePortRange`
 -DestinationPortRange $GetRuleConfig2.DestinationPortRange -SourceAddressPrefix $GetRuleConfig2.SourceAddressPrefix`
 -DestinationAddressPrefix "*"`
 -Priority $GetRuleConfig2.Priority -Access $GetRuleConfig2.Access`
-Direction $GetRuleConfig2.Direction | Set-AzNetworkSecurityGroup