Resources that use mysql.exe fail due to password warnings generating false error output

[andy1547]

In MySQL 5.6.35 I get this error when trying to ensure a database is absent:

writeErrorStream      : True
Exception             : System.Management.Automation.RemoteException: Warning: Using a password on the command line 
                        interface can be insecure.
TargetObject          : Warning: Using a password on the command line interface can be insecure.
CategoryInfo          : NotSpecified: (Warning: Using ...an be insecure.:String) [], RemoteException
FullyQualifiedErrorId : NativeCommandError
ErrorDetails          : 
InvocationInfo        : System.Management.Automation.InvocationInfo
ScriptStackTrace      : at Invoke-MySqlCommand, C:\Program 
                        Files\WindowsPowerShell\Modules\xMySql\2.1.0.0\MSFT_xMySqlUtilities.psm1: line 31
                        at Get-TargetResource, C:\Program Files\WindowsPowerShell\Modules\xMySql\2.1.0.0\DscResources\MS
                        FT_xMySqlDatabase\MSFT_xMySqlDatabase.psm1: line 31
                        at Test-TargetResource, C:\Program Files\WindowsPowerShell\Modules\xMySql\2.1.0.0\DscResources\M
                        SFT_xMySqlDatabase\MSFT_xMySqlDatabase.psm1: line 119
PipelineIterationInfo : {0, 0}
PSMessageDetails      : 

If I comment out Read-ErrorFile in both set and get resource I no longer get the error, it appears the standard error output contains these warning messages.
See http://stackoverflow.com/questions/20751352/suppress-warning-messages-using-mysql-from-within-terminal-but-password-written for suggested work arounds for this.

Exporting the MYSQL_PASSWORD variable works as temporary solution, can anybody think of a better workaround?