handle input XML without existing IPs. Skip fake_ip logic if max_poin…

[seanmcculloch]

…ts == 0, fix off-by-1 dimension bug

#115 #116

Description of the changes you made

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• 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)
• This change requires a documentation update

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Checklist of Requirements

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added unit tests
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

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[seanmcculloch]

Addressing #115 , #116 .