Fixes to allow collection of metadata from biomodels.

[luciansmith]

• Don't use windows-style paths for URIs.
• Not all records have the information we assumed was there; only add it if present.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov[bot]]

Codecov Report

Patch coverage: 85.71% and project coverage change: -0.02 :warning:

Comparison is base (65e1956) 95.83% compared to head (4bb3299) 95.82%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #128 +/- ## ========================================== - Coverage 95.83% 95.82% -0.02% ========================================== Files 88 88 Lines 9369 9381 +12 ========================================== + Hits 8979 8989 +10 - Misses 390 392 +2 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `95.82% <85.71%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biosimulators#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/biosimulators/Biosimulators_utils/pull/128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biosimulators) | Coverage Δ | | |---|---|---| | [biosimulators\_utils/ref/utils.py](https://codecov.io/gh/biosimulators/Biosimulators_utils/pull/128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biosimulators#diff-Ymlvc2ltdWxhdG9yc191dGlscy9yZWYvdXRpbHMucHk=) | `92.72% <84.61%> (-0.74%)` | :arrow_down: | | [biosimulators\_utils/omex\_meta/utils.py](https://codecov.io/gh/biosimulators/Biosimulators_utils/pull/128?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biosimulators#diff-Ymlvc2ltdWxhdG9yc191dGlscy9vbWV4X21ldGEvdXRpbHMucHk=) | `89.55% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biosimulators). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=biosimulators)

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