Chore: don't pass empty language code to tesseract CLI

[yuming-long]

Summary:

Close: #1920

• stop passing in empty string from languages to tesseract, which will result in passing empty string to language config -l for the tesseract CLI
• also stop passing in duplicate language code from languages to tesseract OCR
• if we failed to convert any iso languages from the languages parameter, proceed OCR with eng as default

Test

• First confirm the tesseract error Estimating resolution as X before this:
  • on the unstructured-api repo with main branch, run make run-web-app
  • curl to test error from empty string, or just any wrong input like -F 'languages="eng,de"':

curl -X 'POST'  'http://0.0.0.0:8000/general/v0/general' \
 -H 'accept: application/json'   \
-H 'Content-Type: multipart/form-data' \
-F 'files=@sample-docs/layout-parser-paper-with-table.jpg' \
-F 'languages=""'  \
-F 'strategy=hi_res'  \
-F 'pdf_infer_table_structure=True' \
| jq -C . | less -R

• after this change:
  • in your unstructured API env, cd to unstructured repo and install it locally with pip install -e .
  • check out to this branch
  • run make run-web-app again in api repo
  • the curl command return output and see warning in log

[Coniferish]

@yuming-long, do you use pyenv for env management? I'm having trouble installing the local changes to unstructured in my api environment. Will keep working on it, but figured I'd ask.

[yuming-long]

Hi @Coniferish, yes I use pyenv.
I am on api repo, and then pyenv activate unstructured-api, cd ../unstructured, and pip install -e . works for me. Let me know if you need help on the error :)

[Coniferish]

Sounds good. It's probably because I set 'local' envs for the different repos and need to clear out the config or something