fix(util): division by zero when logging progress in some cases

[jansegre]

Motivation

When testing #938 I got a division by zero error. I haven't debugged if the situation is realistic, but either way it seems to be better to handle the case where the denominator is 0.

Acceptance Criteria

• Handle the case where progress_ == 0 by simply doing remaining_time = '?'

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 85.03%. Comparing base (7bcc669) to head (f273716).

Files	Patch %	Lines
hathor/util.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #980      +/-   ##
==========================================
- Coverage   85.09%   85.03%   -0.06%     
==========================================
  Files         294      294              
  Lines       22798    22800       +2     
  Branches     3434     3435       +1     
==========================================
- Hits        19400    19389      -11     
- Misses       2712     2725      +13     
  Partials      686      686              

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