more infomation if get_var fails

[weiyuan-jiang]

provide more information if reading variables from netcdf file failed

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Trivial change (affects only documentation or cleanup)

Checklist:

• I have tested this change with a run of GEOSgcm (if non-trivial)
• I have added one of the required labels (0 diff, 0 diff trivial, 0 diff structural, non 0-diff)
• I have updated the CHANGELOG.md accordingly following the style of Keep a Changelog

[weiyuan-jiang]

Part of the effort to address issue #1285 .

[mathomp4]

@weiyuan-jiang Is there a reason you are blocking this? More updates coming?

(And I guess, did you test this with a GEOS run?)

[weiyuan-jiang]

@weiyuan-jiang Is there a reason you are blocking this? More updates coming?

(And I guess, did you test this with a GEOS run?)

Yes, I block this PR because @rmontuoro reported that there was still un-trapped error. I am wondering if that is reproducible on our GEOSgcm

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