added missing import statement for logging to enable error messages i… #2710
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…n a pop up window when slit width is set larger than slit length
Description
This PR returns the missing import statement for logging in the smearing widget.
Fixes #2708
How Has This Been Tested?
Simulated data using the sphere model in the GUI with slit smearing at the following three conditions:
Conditions 2 and 3 should result in an error message being presented in a pop-up window that explains the proper usage of the length and width terms for slit smearing. "CRITICAL" messages should also appear in the log explorer. Condition 1 should run normally and simulate the slit-smeared data.
Review Checklist (please remove items if they don't apply):