Generate only Po files with content

[jzsn2018]

Is your feature request related to a problem? Please describe. When I use extract message, some files without message ID defined in the source file will also be generated with an empty Po file, I hope it is not allowed when generating files

Describe proposed solution Do not generate an empty file with only this

msgid ""
msgstr ""
"POT-Creation-Date: ***************\n"
"MIME-Version: 1.0\n"
"Content-Type: text/plain; charset=utf-8\n"
"Content-Transfer-Encoding: 8bit\n"
"X-Generator: @lingui/cli\n"
"Language: en\n"

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered.

Additional context run lingui extract command

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