pulp file content upload fails if file is smaller than one chunk

[mdellweg]

Summary

SSIA

Steps to reproduce

pulp file content upload --relative-path "README.md" --file "README.md"

Expected behavior

upload the file using the multipart encoding

Stacktrace/Error log

$ pulp -vv file content upload --relative-path "README.md" --file "README.md" 
post http://pulp3-source-debian11/rerouted/djnd/api/v3/content/file/files/
  User-Agent: Pulp-CLI/0.15.0.dev
  Accept-Encoding: gzip, deflate
  Accept: application/json
  Connection: keep-alive
  Content-Length: 441
  Content-Type: application/x-www-form-urlencoded
  Authorization: Basic YWRtaW46cGFzc3dvcmQ=
'relative_path=README.md&file=%23+Pulp+command+line+interface%0A&file=%0A&file=This+is+a+command+line+interface+for+Pulp+3.%0A&file=%0A&file=This+software+is+in+beta+and+future+releases+may+include+backwards+incompatible+changes.%0A&file=%0A&file=Check+out+our+%5Bdocs%5D%28https%3A%2F%2Fdocs.pulpproject.org%2Fpulp_cli%2F%29+and+the+%5Bquickstart+guide%5D%28https%3A%2F%2Fdocs.pulpproject.org%2Fpulp_cli%2Fquickstart%2F%29+to+get+started.%0A'
Antwort: 400
Error: {"file":["The submitted data was not a file. Check the encoding type on the form."]}

Pulp and pulp-cli version info

0.15.0.dev0

Additonal context

One can circumvent the issue by specifying an absurd small batch size.