Update howard-hughes-medical-institute.csl

[michavissar]

Added 3 lines instructing to print URL if PMID and DOI are both missing

[github-actions[bot]]

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[github-actions[bot]]

:smiley: Your submission passed all our automated tests.

Below are some sample citations generated based on your proposed changes:

howard-hughes-medical-institute.csl (modified style)

1,2
3,4

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1. Hancké B, Rhodes M, and Thatcher M, editors. Beyond varieties of capitalism: Conflict, contradiction, and complementarities in the European economy. (2007) ISBN: 978-0-19-920648-3
2. CSL search by example. (2012) URL: http://editor.citationstyles.org/searchByExample/
3. Mares I. Firms and the welfare state: When, why, and how does social policy matter to employers? (2001)
4. Fenner M, Crosas M, Grethe J S, Kennedy D, Hermjakob H, Rocca-Serra P, Durand G, Berjon R, Karcher S, Martone M, and Clark T. A data citation roadmap for scholarly data repositories. (2019) DOI: http://doi.org/10.1038/s41597-019-0031-8

 <span style="vertical-align: super">1,2</span><br/>
 <span style="vertical-align: super">3,4</span><br/>
 <hr/>
 1. Hancké B, Rhodes M, and Thatcher M, editors. Beyond varieties of capitalism: Conflict, contradiction, and complementarities in the European economy. (2007) ISBN: 978-0-19-920648-3<br/>
-2. CSL search by example. (2012)<br/>
+2. CSL search by example. (2012) URL: http://editor.citationstyles.org/searchByExample/<br/>
 3. Mares I. Firms and the welfare state: When, why, and how does social policy matter to employers? (2001)<br/>
 4. Fenner M, Crosas M, Grethe J S, Kennedy D, Hermjakob H, Rocca-Serra P, Durand G, Berjon R, Karcher S, Martone M, and Clark T. A data citation roadmap for scholarly data repositories. (2019) DOI: http://doi.org/10.1038/s41597-019-0031-8<br/>

[michavissar]

Hoping someone can review this small change! Thank you!