Return Inf when data calculated and observed have different sizes

[keurfonluu]

• Changed: return Inf (i.e., invalid model) for models for which the number of calculated velocities does not match input data.

Reminders:

• Run invoke format to make sure the code follows the style guide,
• Add tests for new features or tests that would have caught the bug that you're fixing,
• Write detailed docstrings for all functions, classes and/or methods,
• If adding new functionality, unit test it and add it to the documentation.

[codecov]

Codecov Report

Patch coverage is 100.00% of modified lines.

Files Changed	Coverage
evodcinv/_model.py	100.00%

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