#1393 end simulation when experiment infeasible

[rtimms]

Description

Makes it so that simulations stop when an experiment becomes infeasible

Fixes #1393

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. If necessary, also add to the list of breaking changes.

• 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]

Looks good, thanks!

[codecov]

Codecov Report

Merging #1395 (f7f2dde) into develop (32db967) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1395   +/-   ##
========================================
  Coverage    98.25%   98.25%           
========================================
  Files          277      277           
  Lines        15687    15691    +4     
========================================
+ Hits         15413    15417    +4     
  Misses         274      274           

Impacted Files	Coverage Δ
pybamm/simulation.py	97.20% <100.00%> (+0.04%)	⬆️

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