fix local_op + out distributed

[mtar]

Description

Fix distributed local_op with out != None for empty local arrays.

Issue resolved: #731

Changes proposed:

• set multiples to zero if division by zero occurs

Type of change

• Bug fix (non-breaking change which fixes an issue)

Due Diligence

• All split configurations tested
• Multiple dtypes tested in relevant functions
• Documentation updated (if needed)
• Updated changelog.md under the title "Pending Additions"

Does this change modify the behaviour of other functions? If so, which?

no

[codecov]

Codecov Report

Merging #734 (12e32ac) into master (ebaf73c) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #734   +/-   ##
=======================================
  Coverage   95.81%   95.81%           
=======================================
  Files          63       63           
  Lines        8056     8056           
=======================================
  Hits         7719     7719           
  Misses        337      337           

Flag	Coverage Δ
gpu	94.92% <100.00%> (ø)
unit	94.18% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
heat/core/_operations.py	96.73% <100.00%> (ø)

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