Print more meaningful error messages when suite.xml is malformed

[radoslawkarwacki]

Print more meaningful error messages when suite.xml is malformed

Description

Provide as much data as possible when URLs are empty or duplicated

Motivation and Context

#436

Types of changes

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

Checklist:

• My code follows the code style of this project.
• I have reviewed (and updated if needed) the documentation regarding this change

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I hereby agree to the terms of the AET Contributor License Agreement.

[plutasnyy]

Please update changelog :)

[bambroziak]

Tested and rejected.

There is an issue there:
While I specify two tests on AET suite.xml and in both of them I've malformed (duplicated, left empty urls), I've got output only by first test, there is no any info about second test despite that it is also broken.

Other scenario is while I fix first test and leave second one broken, I've got output without information about that errors are located in test number 2. If first test is broken there is displaying info like that.

Expect of issues above error messages are working fine and displays useful data.

QA Covered.