WRF
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check if WRF_CMAQ is empty first
When WRF_CMAQ is empty, it spews the following error message.
/bin/sh: line 0: [: -eq: unary operator expected
Note target is master
@wkliao Can you refer to other PR and use the template to create a PR? @dwongepa Can you review this PR?
The suggested change is fine. Approve.
@wkliao Can you edit the PR message to be like others? Thanks.
@wkliao Thank you for finding this issue and provided a fix. I have tested and it works. @weisunncar I approve this PR.