If you wanted to exclude results with empty (text) columns, you can filter based on $null values. This will get you all processes with a valid company information:
Where-Object { $_.Company -ne $null } | Select-Object Name, Company, Description
Or not. Sometimes, text can also be an empty string, so you would have to check for that as well:
Get-Process | Where-Object { $_.Company -ne $null } | Where-Object { $_.Company -ne '' } | Select-Object Name, Company, Description
To combine both checks, use a .NET method which checks for null or empty text:
Get-Process | Where-Object { -not [string]::IsNullorEmpty($_.Company) } | Select-Object Name, Company, Description
