Libcal: Empty container element

[rschwab]

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Issue with monthly calendar widget, caused by empty <tr> elements in the table. Screenshot:

• Open Springshare ticket for calendar widget
• Issue resolved by Springshare

Issue on https://calendar.library.ucsc.edu/space/139592/confirmed - role="rowgroup":

• Open Springshare ticket for role=rowgroup
• Issue resolved by Springshare

Issue on spaces like https://calendar.library.ucsc.edu/space/139571 - role="grid"

• Open Springshare ticket for role=grid
• Issue resolved by Springshare