Allow examples/neurons.py to run successfully when neuromorpho is down

[IgorTatarnikov]

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Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
The test running each example script occasionally fails when neuromorpho.org is down.

What does this PR do?
Place the code relating to connecting to neuromorpho.org in a try-catch block that allows the example to still run if a ConnnectionError is encountered.

References

How has this PR been tested?

Tested locally, examples/neurons.py can be run and renders the neuron stored locally.

Is this a breaking change?

No

Does this PR require an update to the documentation?

No

If any features have changed, or have been added. Please explain how the documentation has been updated (and link to the associated PR). See here for details.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.39%. Comparing base (48f655f) to head (3e2ebbf).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #366      +/-   ##
==========================================
+ Coverage   86.96%   87.39%   +0.42%     
==========================================
  Files          27       27              
  Lines        1220     1214       -6     
==========================================
  Hits         1061     1061              
+ Misses        159      153       -6     

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