Created attachment 799758 [details]
Sample files that trigger this bug

Description of problem:
When encounter a corrupted file, zanata failed to show the filename.
Moreover, the error message is so misleading that user have no way to find the actual corrupted file.

For example, the project looks like:
pot/About_Fedora.pot
de/About_Fedora.po
ja/About_Fedora.po

Suppose ja/About_Fedora.po is corrupted, pushing this project you will get:

[INFO] Pushing target doc [name=About_Fedora size=24 client-locale=de] to server [locale=de]
Done in 4 secs
[ERROR] Execution failed:
java.lang.RuntimeException: Operation failed.

    To retry from the last document, please set the following option(s):

        --from-doc "About_Fedora"

.
        at org.zanata.client.commands.push.PushCommand.pushCurrentModule(PushCommand.java:459)
        at org.zanata.client.commands.push.PushCommand.run(PushCommand.java:207)
        at org.zanata.client.commands.ArgsUtil.runCommand(ArgsUtil.java:56)
        at org.zanata.client.ZanataClient.processArgs(ZanataClient.java:164)
        at org.zanata.client.ZanataClient.main(ZanataClient.java:90)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1

It does not show any thing that ja/About_Fedora.po is corrupted.

Version-Release number of selected component (if applicable):
zanata-cli-3.1.2

How reproducible:
Always

Steps to Reproduce:
1. Download and extract the attached file.
2. cd AboutFedora
3. Create project: AboutFedora and version: f13
4. zanata-cli -B  -e  push -s pot -t . --push-type both


Actual results:
[INFO] pushing source doc [name=About_Fedora size=24] to server
Done in 4 secs
[INFO] Pushing target doc [name=About_Fedora size=24 client-locale=de] to server [locale=de]
Done in 4 secs
[ERROR] Execution failed:
java.lang.RuntimeException: Operation failed.

    To retry from the last document, please set the following option(s):

        --from-doc "About_Fedora"

.
        at org.zanata.client.commands.push.PushCommand.pushCurrentModule(PushCommand.java:459)
        at org.zanata.client.commands.push.PushCommand.run(PushCommand.java:207)
        at org.zanata.client.commands.ArgsUtil.runCommand(ArgsUtil.java:56)
        at org.zanata.client.ZanataClient.processArgs(ZanataClient.java:164)
        at org.zanata.client.ZanataClient.main(ZanataClient.java:90)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1



Expected results:
Fail to read ja/About_Fedora.po

Additional info: