Created attachment 791991 [details]
Test .pot file with duplicate msgid

Description of problem:
If the user attempts to upload a .pot that will fail, the javax.ws.rs.WebApplicationException at org.zanata.rest.service.ResourceUtils.transferFromTextFlows(ResourceUtils.java:158) [classes:] will occur.

Version-Release number of selected component (if applicable):
3.0

How reproducible:
Easy always

Steps to Reproduce:
1. Download the attached test.pot
2. As an admin/maintainer go to a project->project version->Source documents
3. Press Upload Document and navigate to the .pot file
4. Press Upload

Actual results:
"An unexpected error has occurred. Please report this problem with details of what you were attempting."
javax.ws.rs.WebApplicationException
at
org.zanata.rest.service.ResourceUtils.transferFromTextFlows(ResourceUtils.java:158) [classes:]

Expected results:
It should say what happened and, if at all possible, why. e.g. (Duplicate msgid detected)

Additional info: