Issue #1259870, Reinstate the test for a missing date argument for the pager and add to the message a warning that the problem could be that the default date is missing from the argument.

Issue #1305938 by kristiaanvandeneynde and KarenS, Make sure the overlapping items work correctly with half hour grouping, and don't allow it for custom time groupings.

Issue #1260380, Some items showing up in wrong time periods because wrong value is used to create the start date bucket.

Issue #1383782 by googletorp, Check if module_exists('taxonomy') before creating taxonomy strip options.

Follow up to #1323280, we should only omit minutes from the heading if the grouping has no minutes in it.

Issue #1230500, The calendar row logic was failing if there was more than one date field in a node due to a bad return value. Also fixed some errors caused by not returning an empty array for missing values.

Issue #1236610, Allow the calendar style to work with any row plugin that extends the calendar_row_plugin.

Issue #1315328, Default calendar had date arguments in the master, which affected the upcoming view.

Make sure the taxonomy stripe handling works sanely if there are no vocabularies or taxonomy fields to choose from.

The row plugin needs to clone the node before altering it, or other views on the same page that use the same node will acquire things like the 'date_id' that the row plugin is setting.

Change the default setting for the day view and make sure that the style does not try to create overlap items if it is missing the groupby value (which the default view was doing.)

Issue #1168672 Temporary workaround for missing date info in calendar style. Still need a smarter fix.

Issue #1222736 Fix export errors caused when previous export fix of using export plugins got broken by changes in Views.