This bug was discovered in discussion #1877.

If the {custom} filename template tag is used for PCPCombine using the subtract method, the substitution for the 2nd file fails because custom is not properly passed to the new time info dictionary.

Describe the Problem

The hasattr command on this line needs to be replaced:

This should work:
if time_info.get('custom'):

Expected Behavior

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Environment

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1. Machine: (e.g. HPC name, Linux Workstation, Mac Laptop)
2. OS: (e.g. RedHat Linux, MacOS)
3. Software version number(s)

To Reproduce

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3. Scroll down to '....'
4. See error
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https://dtcenter.org/community-code/model-evaluation-tools-met/met-help-desk#ftp

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