Create a check for missing coordinates

[ellesmith88]

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Description

Several cmip6 were reported as missing a coordinate on the ESMValTool - see spreadsheet: https://docs.google.com/spreadsheets/d/1ZU5oj3yaGHHiu3-5HfrdfTFVAodFod-LZ1SD-aSmxdA/edit#gid=389128371

Create a check to identify this