#547 remove sto times zero

[rtimms]

Description

Remove sto*0 in the solid diffusion coefficients. This was fixed by something in an earlier PR which makes binary operators preserve shape during simplify (specifically addition of a scalar and a matrix)

Fixes #547

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ flake8
• All tests pass: $ python run-tests.py --unit
• The documentation builds: $ cd docs and then $ make clean; make html

You can run all three at once, using $ python run-tests.py --quick.

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[valentinsulzer]

nice!

[codecov]

Codecov Report

Merging #724 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #724   +/-   ##
======================================
  Coverage    98.1%   98.1%           
======================================
  Files         175     175           
  Lines        9196    9196           
======================================
  Hits         9022    9022           
  Misses        174     174

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