Remove try-catch wrap in blueoil train command

[suttang]

Motivation and Context

When some error occurred during blueoil train, you can see an error message like below

()

Because there is no appropriate error handling in lmnet/executor/train.py.
So I remove the try-catch syntax to make the error content understandable even a little.

Description

• remove try-catch wrapper in cmd/main.py train

How has this been tested?

run train manually, and test command

make test

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature / Optimization (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[iizukak]

Ownership Approval.

[tkng]

• Readability Approval

[tkng]

/ready

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