[Bug] Add-DbaAgDatabase tries to modify seeding mode on SQL 2014

[GeorgePalacios]

Environmental information

PowerShell version:

PSVersion 5.1.17134.765
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.17134.765
CLRVersion 4.0.30319.42000
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1

dbatools Module version:

Name : dbatools
Path : C:\Program Files\WindowsPowerShell\Modules\dbatools\0.9.834\dbatools.psd1
Version : 0.9.834

SQL Server:

Microsoft SQL Server 2014 (SP3-CU2) (KB4482960) - 12.0.6214.1 (X64)   Feb  2 2019 01:10:18   Copyright (c) Microsoft Corporation  Developer Edition (64-bit) on Windows NT 6.3 <X64> (Build 9600: ) (Hypervisor) 

Report

Errors Received

Steps to Reproduce

Run the command with -SeedingMode parameter set to either Automatic or Manual on a SQL2014 server.

Expected Behavior

Command should execute as expected, accounting for the difference between versions

Actual Behavior

An error is received:

Exception setting "SeedingMode": "Cannot write property SeedingMode. This property is not available on SQL Server 2014."
 At line:179 char:13
 +             $agreplica.SeedingMode = $SeedingMode
 +             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     + CategoryInfo          : NotSpecified: (:) [], SetValueInvocationException
     + FullyQualifiedErrorId : ExceptionWhenSetting